Number System Grade IX

Self Assessment Test 2

Based on Chapter 1

Time: 1 hour

M.M. 25

Note: Q. 1 - 2 carry 1 mark each, Q. 3 - 5 carry 2 marks each, Q. 6-8 carry 3 marks each and Q.9 - 10 carry 4 marks each.

Find the product: $(4-\sqrt{7})(4+\sqrt{7})$.

Express $0.4\overline{56}$ (recurring decimal) in the form $\frac{p}{q}$, where p and q are integers and $q \neq 0$.

Find a point corresponding to $\frac{7}{3} + \sqrt{2}$ on the number line.

Rationalise the denominator of $\frac{1}{\sqrt{7}+\sqrt{3}}$ and subtract it from $\sqrt{7}-\sqrt{3}$.

Evaluate:

(i) $(59049)^{\frac{1}{5}}$

(ii) $\left(\frac{-1}{64}\right)^{-\frac{1}{3}}$

Simplify: $10\sqrt{50} + 3\sqrt{98} - 7\sqrt{200} + 2\sqrt{32} + 4\sqrt{12}$.

Find two irrational numbers in decimal form between $\sqrt{7}$ and $3$.

If $\sqrt{8}=2.828$ and $\sqrt{18}=4.243$, find the value of $\frac{64}{\sqrt{144}-\sqrt{72}}$.

If $\frac{(\sqrt{3}-4)}{(\sqrt{3}+4)} - \frac{(\sqrt{3}+4)}{(\sqrt{3}-4)} = e + f\sqrt{3}$, find e and f where e and f are rational numbers.

If $z = 8 + 3\sqrt{5}$, find:

(i) $\sqrt{z} + \frac{1}{\sqrt{z}}$

(ii) $\sqrt{z} - \frac{1}{\sqrt{z}}$

An interesting question

Q 1 A rectangular floor is 2016" " cm long and 1560" " cm broad. It is to be paved with square tiles of the same size. Find the least possible number of such tiles.

Ans To find the least number of square tiles needed to pave the rectangular floor, we need to find the side length of the largest square tile that can exactly measure both the length and breadth of the floor. In other words, we need to find the greatest common divisor (GCD) of the dimensions of the floor.

The dimensions of the floor are:

Length = 2016 cm

Breadth = 1560 cm

Let's find the GCD of 2016 and 1560:

GCD(2016, 1560) = 24

Now that we have the side length of the largest square tile that can exactly measure both dimensions of the floor, let's calculate the number of such tiles required to pave the floor. We can do this by dividing the area of the floor by the area of one tile:

Number of tiles = (Area of the floor) / (Area of one tile)

= (Length x Breadth) / (Side length of tile)^2

= (2016 x 1560) /$ (24^2)$

= (3144960) / (576)

= 5460

Therefore, the least possible number of square tiles required to pave the floor is 5460.Q 1 A rectangular floor is 2016" " cm long and 1560" " cm broad. It is to be paved with square tiles of the same size. Find the least possible number of such tiles.

Ans To find the least number of square tiles needed to pave the rectangular floor, we need to find the side length of the largest square tile that can exactly measure both the length and breadth of the floor. In other words, we need to find the greatest common divisor (GCD) of the dimensions of the floor.

The dimensions of the floor are:

Length = 2016 cm

Breadth = 1560 cm

Let's find the GCD of 2016 and 1560:

GCD(2016, 1560) = 24

Now that we have the side length of the largest square tile that can exactly measure both dimensions of the floor, let's calculate the number of such tiles required to pave the floor. We can do this by dividing the area of the floor by the area of one tile:

Number of tiles = (Area of the floor) / (Area of one tile)

= (Length x Breadth) / (Side length of tile)^2

= (2016 x 1560) /$ (24^2)$

= (3144960) / (576)

= 5460

Therefore, the least possible number of square tiles required to pave the floor is 5460.

Solving Quadratic Equations

Examples of Solving Quadratic Equations

Example 1:

Solve $x^2 - 3x - 4 = 0$

Solution: $x = \frac{-(-3) \pm \sqrt{(-3)^2 - 4*1*(-4)}}{2*1} = \frac{3 \pm \sqrt{9 + 16}}{2} = \frac{3 \pm 5}{2}$, so $x = -1, 4$

Example 2:

Solve $x^2 + 2x - 8 = 0$

Solution: $x = \frac{-2 \pm \sqrt{2^2 - 4*1*(-8)}}{2*1} = \frac{-2 \pm \sqrt{4 + 32}}{2} = \frac{-2 \pm 6}{2}$, so $x = -4, 2$

Example 3:

Solve $2x^2 - 5x + 3 = 0$

Solution: $x = \frac{5 \pm \sqrt{(-5)^2 - 4*2*3}}{2*2} = \frac{5 \pm \sqrt{25 - 24}}{4} = \frac{5 \pm 1}{4}$, so $x = 1, \frac{3}{2}$

Example 4:

Solve $x^2 - 4 = 0$

Solution: $x = \frac{-0 \pm \sqrt{0 - 4*1*(-4)}}{2*1} = \frac{0 \pm \sqrt{16}}{2} = \frac{0 \pm 4}{2}$, so $x = -2, 2$

Example 5:

Solve $3x^2 - 6x + 3 = 0$

Solution: $x = \frac{6 \pm \sqrt{(-6)^2 - 4*3*3}}{2*3} = \frac{6 \pm \sqrt{36 - 36}}{6} = 1$

How to solve quadratic equation?

Steps to Solve a Quadratic Equation by the Quadratic Formula

Given a quadratic equation in the form:

$$ax^2 + bx + c = 0$$

Step 1: Identify the values of $a$, $b$, and $c$.

Step 2: Substitute the values into the quadratic formula:

$$x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$$

Step 3: Calculate the value inside the square root ($b^2 - 4ac$), also known as the discriminant.

Step 4: If the discriminant is positive, the equation has two real solutions. If it's zero, the equation has one real solution. If it's negative, the equation has two complex solutions.

Step 5: Solve for $x$ by substituting the values of $a$, $b$, and $c$ into the formula and simplifying.

Understanding redox reactions with examples

10 Examples of Redox Reactions and How to Balance Them

Example 1: Hydrogen and fluorine combining to form hydrogen fluoride:

$ \text{H}_2 + \text{F}_2 \rightarrow 2\text{HF} $

Example 2: Sodium and chlorine reacting to form sodium chloride:

$ 2\text{Na} + \text{Cl}_2 \rightarrow 2\text{NaCl} $

Example 3: Iron(III) oxide reacting with carbon monoxide to form iron and carbon dioxide:

$ 2\text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 4\text{Fe} + 3\text{CO}_2 $

Example 4: Hydrogen peroxide decomposing into water and oxygen:

$ 2\text{H}_2\text{O}_2 \rightarrow 2\text{H}_2\text{O} + \text{O}_2 $

Example 5: The reaction between zinc and hydrochloric acid to form zinc chloride and hydrogen gas:

$ \text{Zn} + 2\text{HCl} \rightarrow \text{ZnCl}_2 + \text{H}_2 $

Example 6: The reaction between potassium permanganate, sodium sulfite, and water to form manganese dioxide, potassium sulfate, and sodium sulfate:

$ 2\text{KMnO}_4 + 5\text{Na}_2\text{SO}_3 + 3\text{H}_2\text{O} \rightarrow 2\text{MnO}_2 + 5\text{Na}_2\text{SO}_4 + 2\text{KOH} $

Example 7: The reaction between sodium and water to form sodium hydroxide and hydrogen:

$ 2\text{Na} + 2\text{H}_2\text{O} \rightarrow 2\text{NaOH} + \text{H}_2 $

Example 8: The reaction between copper(II) sulfate and zinc to form zinc sulfate and copper:

$ \text{CuSO}_4 + \text{Zn} \rightarrow \text{ZnSO}_4 + \text{Cu} $

Example 9: The reaction between hydrogen and nitrogen to form ammonia:

$ 3\text{H}_2 + \text{N}_2 \rightarrow 2\text{NH}_3 $

Example 10: The reaction between magnesium and oxygen to form magnesium oxide:

$ 2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO} $

To balance these reactions, you ensure that the number of atoms of each element is the same on both sides of the equation. This often involves adding coefficients (the numbers in front of the chemical formulas).

Understand redox reactions the simplest way

Redox Reactions: Sharing Electrons Just Like Gummy Bears!

Imagine you have a big bag of gummy bears and your friend has none. To be fair, you decide to share some of your gummy bears with your friend. You're being generous and your friend is happy!

This scenario is similar to what happens in a redox reaction. The gummy bears in our story are like little packets of energy called electrons. In a redox reaction, one substance shares some of its electrons with another substance.

When something shares or gives away electrons, we say it is "oxidized" (like you giving away gummy bears). The one that takes or receives electrons is "reduced" (like your friend receiving the gummy bears).

Let's use a simple example: a battery in a toy car. The battery has chemicals inside it that go through a redox reaction. One chemical gives away electrons (is oxidized) and the other chemical receives them (is reduced). These moving electrons are what power the toy car.

So, redox reactions are like sharing gummy bears, but instead of gummy bears, it's electrons being shared! This sharing is very important and it helps lots of things work, from batteries to our own bodies!

Types of reactions with examples.

Examples of Balancing Chemical Equations

Example 1: Combination Reaction

Consider the reaction between iron ($\text{Fe}$) and oxygen ($\text{O}_2$) to produce iron(III) oxide ($\text{Fe}_2\text{O}_3$). The unbalanced equation is:

$\text{Fe} + \text{O}_2 \rightarrow \text{Fe}_2\text{O}_3$

To balance it, we add coefficients:

$4\text{Fe} + 3\text{O}_2 \rightarrow 2\text{Fe}_2\text{O}_3$

Example 2: Decomposition Reaction

Consider the decomposition of water ($\text{H}_2\text{O}$) into hydrogen ($\text{H}_2$) and oxygen ($\text{O}_2$). The unbalanced equation is:

$\text{H}_2\text{O} \rightarrow \text{H}_2 + \text{O}_2$

To balance it, we add coefficients:

$2\text{H}_2\text{O} \rightarrow 2\text{H}_2 + \text{O}_2$

Example 3: Single Replacement Reaction

Consider the reaction between copper(II) sulfate ($\text{CuSO}_4$) and iron ($\text{Fe}$) to produce iron(II) sulfate ($\text{FeSO}_4$) and copper ($\text{Cu}$). The unbalanced equation is:

$\text{CuSO}_4 + \text{Fe} \rightarrow \text{FeSO}_4 + \text{Cu}$

This equation is already balanced.

Example 4: Double Replacement Reaction

Consider the reaction between silver nitrate ($\text{AgNO}_3$) and sodium chloride ($\text{NaCl}$) to produce silver chloride ($\text{AgCl}$) and sodium nitrate ($\text{NaNO}_3$). The unbalanced equation is:

$\text{AgNO}_3 + \text{NaCl} \rightarrow \text{AgCl} + \text{NaNO}_3$

This equation is already balanced.

How to balance chemical equations?

How to Balance a Chemical Equation

Balancing chemical equations is crucial in chemistry because it respects the law of conservation of mass, which states that matter cannot be created or destroyed.

Here's a step-by-step process to balance a simple chemical equation:

Step 1: Write down the unbalanced equation.

Let's consider the reaction between hydrogen ($\text{H}_2$) and oxygen ($\text{O}_2$) to produce water ($\text{H}_2\text{O}$). The unbalanced equation is:

$\text{H}_2 + \text{O}_2 \rightarrow \text{H}_2\text{O}$

Step 2: Count the number of atoms for each element in both reactants and products.

In this case, on the left side (Reactants) you have 2 hydrogen atoms and 2 oxygen atoms. On the right side (Product) you have 2 hydrogen atoms and 1 oxygen atom.

Step 3: Use coefficients (the numbers in front of atoms or molecules) to balance the equation.

We need to balance the oxygen atoms first. To do this, you can put a coefficient in front of $\text{H}_2\text{O}$ to make 2 water molecules, which gives 2 oxygen atoms:

$\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}$

Now we have 4 hydrogen atoms on the right side, so we need to balance the hydrogen atoms by putting a coefficient in front of $\text{H}_2$ on the left side:

$2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}$

Now, there are 4 hydrogen atoms and 2 oxygen atoms on both sides, so the equation is balanced.

Step 4: Check your work to make sure that there are the same number of each type of atom on both sides of the equation.

We have 4 hydrogens and 2 oxygens on both sides, so the equation is balanced.

Remember, you can only change the coefficients (the numbers in front of the molecules), not the subscripts (the numbers that tell you the number of atoms in a molecule). Changing the subscripts would change the identity of the substance.

Difference in Respiration and Breathing

	Respiration	Breathing
Basic                  Definition	Respiration is a metabolic process where organisms convert nutrients into energy, and waste products are produced.	Breathing is a physical process of inhaling and exhaling air.
Component        Involved	This involves the whole body system, including cells where metabolism takes place.	This involves mainly the respiratory system: nose, trachea, lungs, and diaphragm.
Purpose	The primary purpose of respiration is to produce energy for the body by breaking down glucose and other nutrients.	The main purpose of breathing is to supply the body with oxygen and remove carbon dioxide.
Process	Respiration is a chemical process involving multiple steps, such as glycolysis, the Krebs cycle, and oxidative phosphorylation.	Breathing is a mechanical process that can be divided into two phases: inhalation and exhalation.

Polynomial Divisions

 Grade IX  Polynomial Divisions

Q1 $\frac{x^{4}+3 x^{2}+4}{x+1}$

Q2 $\frac{6 x+x^{2}+3}{x-1}$

Q3 $\frac{8 x^{3}+2}{2 x+1}$

Q4 $\frac{36 x^{2}+x+9}{6 x^{2}+3}$

Q5 $\frac{x^{2}+1}{x+3}$

Q6 $\frac{2 x^{2}+x-3}{x-1}$

Q7 $\frac{3-4 x+x^{3}}{1+x}$

Q8 $\frac{24 x^{3}+x+9}{3 x^{2}+x+1}$

Q9 $\frac{4x^{4}-x^{2}-1}{x^{2}-1}$

Q10 $\frac{18 x^{2}+2 x+1}{6 x-2}$

Animal Nutrition Grade 7

Animal Nutrition

Total Questions - 176

MCQ. Easy Level (29 Questions)

Q1.  What type of nutrition allows one organism to feed upon another organism?

1. Autotrophic Nutrition

2. Chemoautotrophic Nutrition

3.  Heterotrophic Nutrition

4. Holozoic Nutrition 

Q2.  What is the taking in of food?

1. Ingestion 

2. Elimination

3. Excretion

4. Respiration

Q3.  What is the process of breaking down of food into simple, soluble molecules?

1. Circulation

2. Excretion

3. Respiration

4. Digestion 

Q4.  What is the process by which digested food enters the blood?

1. Secretion

2. Excretion

3. Ingestion

4. Absorption 

Q5.  What is the process by which the food carried by the blood is utilised by the body?

1. Assimilation 

2. Digestion

3. Respiration

4. Elimination

Q6.  What is the process by which undigested food is thrown out of the body?

1. Egestion 

2. Excretion

3. Defecation

4. Digestion

Q7.  What is the tongue?

1. Teeth

2. Muscular Organ Attached To The Floor Of The Mouth 

3. Esophagus

4. Salivary Gland

Q8.  How does the tongue help chewing?

1. Helps To Produce Saliva

2. Pushing The Food Towards The Teeth 

3. Helps To Taste The Food

4. None Of The Above

Q9.  What is secreted by the salivary glands?

1. Saliva 

2. Blood

3. Tears

4. Sweat

Q10.  What enzyme is present in saliva?

1. Amylase 

2. Protease

3. Lipase

4. Nuclease

Q11.  What does amylase act on?

1. Protein

2. Fat

3. Sugar

4. Starch 

Q12.  The tongue rolls chewed food into a ball and pushes it into a short muscular tube called ________________?

1. Stomach

2. Mouth

3. Esophagus

4. Pharynx  

Q13.  What is the long tube from the pharynx called?

1. Large Intestine

2. Small Intestine

3. Stomach

4. Oesophagus 

Q14.  What organ lies behind the stomach?

1. Liver

2. Spleen

3. Kidney

4. Pancreas 

Q15.  What organ lies in front of the stomach?

1. Kidney

2. Spleen

3. Liver 

4. Gallbladder

Q16.  What does the pancreas secrete?

1. Pancreatic Juice 

2. Saliva

3. Stomach Acid

4. Bile

Q17.  Where is bile stored?

1. Bladder

2. Gallbladder 

3. Kidney

4. Stomach

Q18.  What does bile make?

1. Aids In The Absorption Of Vitamins And Minerals

2. Digestion Of Fats Easier 

3. None Of The Above

4. Helps To Break Down Carbohydrates

Q19.  What are the folds in the inner wall of the small intestine called?

1. Gills

2. Teeth

3. Villi 

4.  Fingers

Q20.  What increase the surface available for adsorption?

1. Villi 

2. Large Intestine

3. Stomach

4. Small Intestine

Q21.  What is absorbed in the large intestine?

1. Water 

2. Air

3. Bacteria

4. Food

Q22.  What is the part of the stomach that cows, buffaloes and other grass-eating animals store grass in?

1. Reticulum

2. Omasum

3. Rumen 

4. Abomasum

Q23.  What is digested by the action of certain bacteria which are not present in humans?

1. Protein

2. Cellulose 

3. Carbohydrate

4. Lipid

Q24.  What is the large sac-like structure between the oesophagus and the small intestine called?

1. Large Intestine

2. Rectum

3. Stomach

4. Caecum 

Q25.  The cellulose of the food is digested by the action of what?

1. Certain Bacteria 

2. The Large Intestine

3. The Stomach

4. The Small Intestine

Q26.  What has many finger-like outgrowths?

1. The Bladder

2. The Outer Wall Of The Small Intestine

3. The Inner Wall Of The Small Intestine 

4. The Stomach

Q27.  What does the bile help to digest?

1. Which Component Of The Food Does It Help To Digest 

2. Carbohydrates

3. Proteins

4. Fats 

Q28.  What is formed when food is digested in amoeba?

1. Faeces 

2. Food Vacuole 

3. Water

4. Air

Q29.  What part of the digestive canal is involved in digestion?

1. Large Intestine

2. Small Intestine 

3. Stomach

4. Rectum 

MCQ. Medium Level (75 Questions)

Q1.  What type of nutrition allows one organism to feed upon another organism?

 I.  Heterotrophic Nutrition

 II. Chemoautotrophic Nutrition

 III. Autotrophic Nutrition

 IV. Holozoic Nutrition 

Which of the options given above is/are correct:

1. II and I only.

2. IV only.

3. IV, II and I only.

4. III only.

Q2.  What is the taking in of food?

 I. Respiration

 II. Ingestion 

 III. Excretion

 IV. Elimination

Which of the options given above is/are correct:

1. III and I only.

2. II only.

3. II, III and I only.

4. IV only.

Q3.  What is not the taking in of food?

 I. Ingestion 

 II. Elimination

 III. Respiration

 IV. Excretion

Which of the options given above is/are correct:

1. I only.

2. I, III and II only.

3. III, II and IV only.

4. All the above.

Q4.  What is the process of breaking down of food into simple, soluble molecules?

 I. Respiration

 II. Circulation

 III. Excretion

 IV. Digestion 

Which of the options given above is/are correct:

1. II and I only.

2. IV only.

3. IV, II and I only.

4. III only.

Q5.  What is not the process of breaking down of food into simple, soluble molecules?

 I. Circulation

 II. Respiration

 III. Digestion 

 IV. Excretion

Which of the options given above is/are correct:

1. III only.

2. III, II and I only.

3. II, I and IV only.

4. All the above.

Q6.  What is the process by which digested food enters the blood?

 I. Excretion

 II. Absorption 

 III. Secretion

 IV. Ingestion

Which of the options given above is/are correct:

1. III and I only.

2. II only.

3. II, III and I only.

4. IV only.

Q7.  What is not the process by which digested food enters the blood?

 I. Excretion

 II. Ingestion

 III. Secretion

 IV. Absorption 

Which of the options given above is/are correct:

1. IV only.

2. IV, II and I only.

3. II, I and III only.

4. All the above.

Q8.  What is the process by which the food carried by the blood is utilised by the body?

 I. Elimination

 II. Respiration

 III. Assimilation 

 IV. Digestion

Which of the options given above is/are correct:

1. II and I only.

2. III only.

3. III, II and I only.

4. IV only.

Q9.  What is not the process by which the food carried by the blood is not utilised by the body?

 I. Digestion

 II. Respiration

 III. Elimination

 IV. Assimilation 

Which of the options given above is/are correct:

1. IV only.

2. IV, II and I only.

3. II, I and III only.

4. All the above.

Q10.  What is the process by which undigested food is thrown out of the body?

 I. Excretion

 II. Egestion 

 III. Digestion

 IV. Defecation

Which of the options given above is/are correct:

1. III and I only.

2. II only.

3. II, III and I only.

4. IV only.

Q11.  What is not the process by which undigested food is not thrown out of the body?

 I. Defecation

 II. Digestion

 III. Egestion 

 IV. Excretion

Which of the options given above is/are correct:

1. III only.

2. III, II and I only.

3. II, I and IV only.

4. All the above.

Q12.  What is the tongue a muscular organ attached to the floor of the mouth?

 I. Touch

 II. Smell

 III. Saliva 

 IV. Taste

Which of the options given above is/are correct:

1. II and I only.

2. III only.

3. III, II and I only.

4. IV only.

Q13.  What is not the tongue a muscular organ attached to the floor of the mouth?

 I. Touch

 II. Smell

 III. Saliva 

 IV. Taste

Which of the options given above is/are correct:

1. III only.

2. III, II and I only.

3. II, I and IV only.

4. All the above.

Q14.  What is the tongue?

 I. Salivary Gland

 II. Teeth

 III. Esophagus

 IV. Muscular Organ Attached To The Floor Of The Mouth 

Which of the options given above is/are correct:

1. II and I only.

2. IV only.

3. IV, II and I only.

4. III only.

Q15.  What is not the tongue?

 I. Esophagus

 II. Salivary Gland

 III. Muscular Organ Attached To The Floor Of The Mouth 

 IV. Teeth

Which of the options given above is/are correct:

1. III only.

2. III, II and I only.

3. II, I and IV only.

4. All the above.

Q16.  How does the tongue help chewing?

 I. Helps To Produce Saliva

 II. Pushing The Food Towards The Teeth 

 III. None Of The Above

 IV. Helps To Taste The Food

Which of the options given above is/are correct:

1. III and I only.

2. II only.

3. II, III and I only.

4. IV only.

Q17.  How does not the tongue help chewing?

 I. Pushing The Food Towards The Teeth 

 II. None Of The Above

 III. Helps To Taste The Food

 IV. Helps To Produce Saliva

Which of the options given above is/are correct:

1. I only.

2. I, III and II only.

3. III, II and IV only.

4. All the above.

Q18.  What is secreted by the salivary glands?

 I. Sweat

 II. Saliva 

 III. Tears

 IV. Blood

Which of the options given above is/are correct:

1. III and I only.

2. II only.

3. II, III and I only.

4. IV only.

Q19.  What is not secreted by the salivary glands?

 I. Tears

 II. Blood

 III. Saliva 

 IV. Sweat

Which of the options given above is/are correct:

1. III only.

2. III, II and I only.

3. II, I and IV only.

4. All the above.

Q20.  What is secreted by the salivary glands?

 I. Sweat

 II. Saliva 

 III. Blood

 IV. Tears

Which of the options given above is/are correct:

1. III and I only.

2. II only.

3. II, III and I only.

4. IV only.

Q21.  What is not secreted by the salivary glands?

 I. Blood

 II. Saliva 

 III. Tears

 IV. Sweat

Which of the options given above is/are correct:

1. II only.

2. II, III and I only.

3. III, I and IV only.

4. All the above.

Q22.  What enzyme is present in saliva?

 I. Lipase

 II. Nuclease

 III. Amylase 

 IV. Protease

Which of the options given above is/are correct:

1. II and I only.

2. III only.

3. III, II and I only.

4. IV only.

Q23.  What enzyme is not present in saliva?

 I. Nuclease

 II. Amylase 

 III. Protease

 IV. Lipase

Which of the options given above is/are correct:

1. II only.

2. II, III and I only.

3. III, I and IV only.

4. All the above.

Q24.  What does amylase act on?

 I. Protein

 II. Sugar

 III. Fat

 IV. Starch 

Which of the options given above is/are correct:

1. II and I only.

2. IV only.

3. IV, II and I only.

4. III only.

Q25.  What does not amylase act on?

 I. Fat

 II. Starch 

 III. Sugar

 IV. Protein

Which of the options given above is/are correct:

1. II only.

2. II, III and I only.

3. III, I and IV only.

4. All the above.

Q26.  The tongue rolls chewed food into a ball and pushes it into a short muscular tube called the pharynx. from?

 I. Esophagus

 II. Mouth

 III. Pharynx 

 IV. Stomach

Which of the options given above is/are correct:

1. II and I only.

2. III only.

3. III, II and I only.

4. IV only.

Q27.  What is the long tube from the pharynx called?

 I. Oesophagus 

 II. Stomach

 III. Small Intestine

 IV. Large Intestine

Which of the options given above is/are correct:

1. III and II only.

2. I only.

3. I, III and II only.

4. IV only.

Q28.  What is not the long tube from the pharynx called?

 I. Large Intestine

 II. Stomach

 III. Oesophagus 

 IV. Small Intestine

Which of the options given above is/are correct:

1. III only.

2. III, II and I only.

3. II, I and IV only.

4. All the above.

Q29.  What organ lies behind the stomach?

 I. Liver

 II. Spleen

 III. Kidney

 IV. Pancreas 

Which of the options given above is/are correct:

1. II and I only.

2. IV only.

3. IV, II and I only.

4. III only.

Q30.  What organ lies in front of the stomach?

 I. Kidney

 II. Spleen

 III. Gallbladder

 IV. Liver 

Which of the options given above is/are correct:

1. II and I only.

2. IV only.

3. IV, II and I only.

4. III only.

Q31.  What does the pancreas secrete?

 I. Bile

 II. Pancreatic Juice 

 III. Stomach Acid

 IV. Saliva

Which of the options given above is/are correct:

1. III and I only.

2. II only.

3. II, III and I only.

4. IV only.

Q32.  What does not the pancreas secrete?

 I. Pancreatic Juice 

 II. Saliva

 III. Stomach Acid

 IV. Bile

Which of the options given above is/are correct:

1. I only.

2. I, III and II only.

3. III, II and IV only.

4. All the above.

Q33.  Where is bile stored?

 I. Gallbladder 

 II. Stomach

 III. Kidney

 IV. Bladder

Which of the options given above is/are correct:

1. III and II only.

2. I only.

3. I, III and II only.

4. IV only.

Q34.  Where is not bile stored?

 I. Kidney

 II. Stomach

 III. Bladder

 IV. Gallbladder 

Which of the options given above is/are correct:

1. IV only.

2. IV, II and I only.

3. II, I and III only.

4. All the above.

Q35.  What does bile make?

 I. Digestion Of Fats Easier 

 II. None Of The Above

 III. Aids In The Absorption Of Vitamins And Minerals

 IV. Helps To Break Down Carbohydrates

Which of the options given above is/are correct:

1. III and II only.

2. I only.

3. I, III and II only.

4. IV only.

Q36.  What does not bile make?

 I. None Of The Above

 II. Aids In The Absorption Of Vitamins And Minerals

 III. Digestion Of Fats Easier 

 IV. Helps To Break Down Carbohydrates

Which of the options given above is/are correct:

1. III only.

2. III, II and I only.

3. II, I and IV only.

4. All the above.

Q37.  What are the folds in the inner wall of the small intestine called?

 I. Villi 

 II. Gills

 III.  Fingers

 IV. Teeth

Which of the options given above is/are correct:

1. III and II only.

2. I only.

3. I, III and II only.

4. IV only.

Q38.  What are not the folds in the inner wall of the small intestine called?

 I.  Fingers

 II. Gills

 III. Villi 

 IV. Teeth

Which of the options given above is/are correct:

1. III only.

2. III, II and I only.

3. II, I and IV only.

4. All the above.

Q39.  What increase the surface available for adsorption?

 I. Stomach

 II. Large Intestine

 III. Villi 

 IV. Small Intestine

Which of the options given above is/are correct:

1. II and I only.

2. III only.

3. III, II and I only.

4. IV only.

Q40.  In what part of the body is the undigested food that remains in the small intestine absorbed in the large intestine?

 I. Stomach

 II. Mouth

 III. Small Intestine

 IV. Large Intestine 

Which of the options given above is/are correct:

1. II and I only.

2. IV only.

3. IV, II and I only.

4. III only.

Q41.  In what part of the body is not the undigested food that remains in the small intestine absorbed in the large intestine?

 I. Small Intestine

 II. Large Intestine 

 III. Stomach

 IV. Mouth

Which of the options given above is/are correct:

1. II only.

2. II, III and I only.

3. III, I and IV only.

4. All the above.

Q42.  What is absorbed in the large intestine?

 I. Water 

 II. Bacteria

 III. Food

 IV. Air

Which of the options given above is/are correct:

1. III and II only.

2. I only.

3. I, III and II only.

4. IV only.

Q43.  What is not absorbed in the large intestine?

 I. Food

 II. Air

 III. Water 

 IV. Bacteria

Which of the options given above is/are correct:

1. III only.

2. III, II and I only.

3. II, I and IV only.

4. All the above.

Q44.  Where is the remaining semi-solid waste egested?

 I. The Ears

 II. The Nose

 III. The Mouth

 IV. The Anus 

Which of the options given above is/are correct:

1. II and I only.

2. IV only.

3. IV, II and I only.

4. III only.

Q45.  Where is not the remaining semi-solid waste egested?

 I. The Mouth

 II. The Anus 

 III. The Nose

 IV. The Ears

Which of the options given above is/are correct:

1. II only.

2. II, III and I only.

3. III, I and IV only.

4. All the above.

Q46.  What type of animal is cows, buffaloes and other grass-eating animals chewing continuously even when they are not eating?

 I. Herbivorous Animal

 II. Grass Eating Animal 

 III. Omnivorous Animal

 IV. Carnivorous Animal

Which of the options given above is/are correct:

1. III and I only.

2. II only.

3. II, III and I only.

4. IV only.

Q47.  What is the part of the stomach that cows, buffaloes and other grass-eating animals store grass in?

 I. Reticulum

 II. Omasum

 III. Rumen 

 IV. Abomasum

Which of the options given above is/are correct:

1. II and I only.

2. III only.

3. III, II and I only.

4. IV only.

Q48.  What is not the part of the stomach that cows, buffaloes and other grass-eating animals store grass in?

 I. Abomasum

 II. Omasum

 III. Reticulum

 IV. Rumen 

Which of the options given above is/are correct:

1. IV only.

2. IV, II and I only.

3. II, I and III only.

4. All the above.

Q49.  What is digested by the action of certain bacteria which are not present in humans?

 I. Cellulose 

 II. Protein

 III. Lipid

 IV. Carbohydrate

Which of the options given above is/are correct:

1. III and II only.

2. I only.

3. I, III and II only.

4. IV only.

Q50.  What is the large sac-like structure between the oesophagus and the small intestine called?

 I. Stomach

 II. Large Intestine

 III. Caecum 

 IV. Rectum

Which of the options given above is/are correct:

1. II and I only.

2. III only.

3. III, II and I only.

4. IV only.

Q51.  What is not the large sac-like structure between the oesophagus and the small intestine called?

 I. Rectum

 II. Caecum 

 III. Stomach

 IV. Large Intestine

Which of the options given above is/are correct:

1. II only.

2. II, III and I only.

3. III, I and IV only.

4. All the above.

Q52.  The cellulose of the food is digested by the action of what?

 I. Certain Bacteria 

 II. The Stomach

 III. The Large Intestine

 IV. The Small Intestine

Which of the options given above is/are correct:

1. III and II only.

2. I only.

3. I, III and II only.

4. IV only.

Q53.  The cellulose of the food is not digested by the action of what?

 I. Certain Bacteria 

 II. The Large Intestine

 III. The Stomach

 IV. The Small Intestine

Which of the options given above is/are correct:

1. I only.

2. I, III and II only.

3. III, II and IV only.

4. All the above.

Q54.  What is the term for the inner wall of the small intestine?

 I. _________ 

 II. Large Intestine

 III. Rectum

 IV. Stomach

Which of the options given above is/are correct:

1. III and II only.

2. I only.

3. I, III and II only.

4. IV only.

Q55.  What is not the term for the inner wall of the small intestine?

 I. Rectum

 II. Large Intestine

 III. Stomach

 IV. _________ 

Which of the options given above is/are correct:

1. IV only.

2. IV, II and I only.

3. II, I and III only.

4. All the above.

Q56.  What has many finger-like outgrowths?

 I. The Outer Wall Of The Small Intestine

 II. The Inner Wall Of The Small Intestine 

 III. The Bladder

 IV. The Stomach

Which of the options given above is/are correct:

1. III and I only.

2. II only.

3. II, III and I only.

4. IV only.

Q57.  What has not many finger-like outgrowths?

 I. The Bladder

 II. The Inner Wall Of The Small Intestine 

 III. The Outer Wall Of The Small Intestine

 IV. The Stomach

Which of the options given above is/are correct:

1. II only.

2. II, III and I only.

3. III, I and IV only.

4. All the above.

Q58.  What is the location and function of the small intestine?

 I. The Small Intestine Is A Long, Coiled Tube That Is About 20 Feet Long And Is Located In The Center Of The Abdomen. It Is Responsible For Breaking Down Food And Absorbing Nutrients And Water.

 II. The Small Intestine Is A Long, Coiled Tube That Is About 20 Feet Long And Is Located In The

 III. The Small Intestine Is A Long, Coiled Tube That Is About 20 Feet Long And Is Located In The Center Of The Abdomen. It Is Responsible For Breaking Down Food And Absorbing Nutrients.

 IV. Villi 

Which of the options given above is/are correct:

1. II and I only.

2. IV only.

3. IV, II and I only.

4. III only.

Q59.  What is not the location and function of the small intestine?

 I. Villi 

 II. The Small Intestine Is A Long, Coiled Tube That Is About 20 Feet Long And Is Located In The Center Of The Abdomen. It Is Responsible For Breaking Down Food And Absorbing Nutrients.

 III. The Small Intestine Is A Long, Coiled Tube That Is About 20 Feet Long And Is Located In The

 IV. The Small Intestine Is A Long, Coiled Tube That Is About 20 Feet Long And Is Located In The Center Of The Abdomen. It Is Responsible For Breaking Down Food And Absorbing Nutrients And Water.

Which of the options given above is/are correct:

1. I only.

2. I, III and II only.

3. III, II and IV only.

4. All the above.

Q60.  What is produced in villi?

 I. Stomach Acid

 II. Saliva

 III. Bile 

 IV. Pancreatic Juice

Which of the options given above is/are correct:

1. II and I only.

2. III only.

3. III, II and I only.

4. IV only.

Q61.  What is not produced in villi?

 I. Bile 

 II. Pancreatic Juice

 III. Saliva

 IV. Stomach Acid

Which of the options given above is/are correct:

1. I only.

2. I, III and II only.

3. III, II and IV only.

4. All the above.

Q62.  What does the bile help to digest?

 I. Carbohydrates

 II. Proteins

 III. Which Component Of The Food Does It Help To Digest 

 IV. Fats

Which of the options given above is/are correct:

1. II and I only.

2. III only.

3. III, II and I only.

4. IV only.

Q63.  What does not the bile help to digest?

 I. Which Component Of The Food Does It Help To Digest 

 II. Proteins

 III. Carbohydrates

 IV. Fats

Which of the options given above is/are correct:

1. I only.

2. I, III and II only.

3. III, II and IV only.

4. All the above.

Q64.  What part of the digestive canal is involved in?

 I. The Large Intestine

 II. Which Part Of The Digestive Canal Is Involved In 

 III. The Stomach

 IV. The Small Intestine

Which of the options given above is/are correct:

1. III and I only.

2. II only.

3. II, III and I only.

4. IV only.

Q65.  What part of the digestive canal is not involved in?

 I. The Stomach

 II. The Large Intestine

 III. Which Part Of The Digestive Canal Is Involved In 

 IV. The Small Intestine

Which of the options given above is/are correct:

1. III only.

2. III, II and I only.

3. II, I and IV only.

4. All the above.

Q66.  What part of the digestive canal is involved in - a. absorption of food?

 I. D. Peristalsis

 II. None

 III. C. Secretion Of Digestive Juices

 IV. B. Chewing Of Food 

Which of the options given above is/are correct:

1. II and I only.

2. IV only.

3. IV, II and I only.

4. III only.

Q67.  What part of the digestive canal is not involved in - a. absorption of food?

 I. C. Secretion Of Digestive Juices

 II. B. Chewing Of Food 

 III. D. Peristalsis

 IV. None

Which of the options given above is/are correct:

1. II only.

2. II, III and I only.

3. III, I and IV only.

4. All the above.

Q68.  What is a part of the digestive canal involved in?

 I. Peristalsis

 II. Killing Of Bacteria 

 III. Saliva Production

 IV. Digestion Of Food

Which of the options given above is/are correct:

1. III and I only.

2. II only.

3. II, III and I only.

4. IV only.

Q69.  What is not a part of the digestive canal involved in?

 I. Peristalsis

 II. Saliva Production

 III. Killing Of Bacteria 

 IV. Digestion Of Food

Which of the options given above is/are correct:

1. III only.

2. III, II and I only.

3. II, I and IV only.

4. All the above.

Q70.  What is ________________?

 I. Regurgitation Of Food

 II. Complete Digestion Of Food 

 III.  Incomplete Digestion Of Food

 IV. No Digestion Of Food

Which of the options given above is/are correct:

1. III and I only.

2. II only.

3. II, III and I only.

4. IV only.

Q71.  What is not ________________?

 I. No Digestion Of Food

 II.  Incomplete Digestion Of Food

 III. Complete Digestion Of Food 

 IV. Regurgitation Of Food

Which of the options given above is/are correct:

1. III only.

2. III, II and I only.

3. II, I and IV only.

4. All the above.

Q72.  What is formed when food is digested in amoeba?

 I. Water

 II. Food

 III. Air

 IV. Faeces 

Which of the options given above is/are correct:

1. II and I only.

2. IV only.

3. IV, II and I only.

4. III only.

Q73.  What is not formed when food is not digested in amoeba?

 I. Food

 II. Faeces 

 III. Water

 IV. Air

Which of the options given above is/are correct:

1. II only.

2. II, III and I only.

3. III, I and IV only.

4. All the above.

Q74.  What part of the digestive canal is involved in digestion?

 I. Rectum 

 II. Stomach

 III. Large Intestine

 IV. Small Intestine

Which of the options given above is/are correct:

1. III and II only.

2. I only.

3. I, III and II only.

4. IV only.

Q75.  What part of the digestive canal is not involved in digestion?

 I. Small Intestine

 II. Large Intestine

 III. Stomach

 IV. Rectum 

Which of the options given above is/are correct:

1. IV only.

2. IV, II and I only.

3. II, I and III only.

4. All the above.

MCQ. Hard Level (7 Questions)

Q1.  Read the following statements carefully:

 Statement I:   Class 7th - science - chapter - nutrition in animals holozoic nutrition : in this types of nutrition, one organism feed upon another organism.

 Statement II:  Digestion is not the process of breaking down of food into simple, soluble molecules.

 Statement III: Absorption is the process by which digested food enters the blood.

 Which of the above Statement(s) is/are correct:

1. I and III.

2. II and III only.

3. II only.

4. All Statements are Correct.

Q2.  Read the following statements carefully:

 Statement I:   Egestion is the process by which undigested food is thrown out of the body.

 Statement II:  Class 7th - science - chapter - nutrition in animals the tongue: the tongue is not a muscular organ attached to the floor of the mouth.

 Statement III: The tongue rolls chewed food into a ball and pushes it into short muscular tube called the pharynx.

 Which of the above Statement(s) is/are correct:

1. I and III.

2. II and III only.

3. II only.

4. All Statements are Correct.

Q3.  Read the following statements carefully:

 Statement I:   From the pharynx, the food goes into a long tube called the oesophagus.

 Statement II:  When it forgets to time its movement, food or water enters the windpipe and we choke.

 Statement III: Class 7th - science - chapter - nutrition in animals in the stomach : the food is churned gently in the stomach and mixes thoroughly with the digestive juice.

 Which of the above Statement(s) is/are correct:

1. I and III.

2. II and III only.

3. II only

4. All Statements are Correct.

Q4.  Read the following statements carefully:

 Statement I:   The (semi-liquid) food then enters a long, coiled tube called the small it is here that most of the digestion of food takes place.

 Statement II:  Complex food molecules are not broken down into simple, soluble, molecules that the body can absorb.

 Statement III: The pancreas secretes pancreatic juice and the liver secretes bile.

 Which of the above Statement(s) is/are correct:

1. I and III.

2. II and III only.

3. II only.

4. All Statements are Correct.

Q5.  Read the following statements carefully:

 Statement I:   The undigested food that remains in the small intestine then passes some water is absorbed in the large intestine.

 Statement II:  The remaining semi-solid waste is not egested through the anus.

 Statement III: Cows, buffaloes and other grass-eating animals are chewing continuously even when they are not eating.

 Which of the above Statement(s) is/are correct:

1. I and III.

2. II and III only.

3. II only.

4. All Statements are Correct.

Q6.  Read the following statements carefully:

 Statement I:   Class 7th - science - chapter - nutrition in animals feeding and digestion in amoeba : amoeba is a microscopic single-celled organism found in pond water.

 Statement II:  Amoeba has not a cell membrane, a round, dense nucleus and many small bubble vacuoles in its cytoplasm.

 Statement III: Class 7th - science - chapter - nutrition in animals feeding and digestion in amoeba : digestive juices are secreted into the food vacuole.

 Which of the above Statement(s) is/are correct:

1. I and III.

2. II and III only.

3. II only.

4. All Statements are Correct.

Q7.  Read the following statements carefully:

 Statement I:   The absorbed substances are used for growth maintenance and multiplication.

 Statement II:  The undigested residue of the food is not expelled outside by the vacuole.

 Statement III: Fill in the blanks - the main steps of nutrition in humans are __________, __________, __________, _________ and.

 Which of the above Statement(s) is/are correct:

1. I and III.

2. II and III only.

3. II only.

4. All Statements are Correct.

True & False (46 Questions)

Q1.  Ingestion is the taking in of food.

1. True

2.  False

Q2.  Read the following statements carefully:

 Statement I:  Excretion is the taking in of food.

 Statement II: Ingestion is the taking in of food.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q3.  Digestion is the process of breaking down of food into simple, soluble molecules.

1. True

2.  False

Q4.  Read the following statements carefully:

 Statement I:  Excretion is the process of breaking down of food into simple, soluble molecules.

 Statement II: Digestion is the process of breaking down of food into simple, soluble molecules.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q5.  Absorption is the process by which digested food enters the blood.

1. True

2.  False

Q6.  Read the following statements carefully:

 Statement I:  Excretion is the process by which digested food enters the blood.

 Statement II: Absorption is the process by which digested food enters the blood.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q7.  Assimilation is the process by which the food carried by the blood is utilised by the body.

1. True

2.  False

Q8.  Read the following statements carefully:

 Statement I:  Elimination is the process by which the food carried by the blood is utilised by the body.

 Statement II: Assimilation is the process by which the food carried by the blood is utilised by the body.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q9.  Egestion is the process by which undigested food is thrown out of the body.

1. True

2.  False

Q10.  Read the following statements carefully:

 Statement I:  Defecation is the process by which undigested food is thrown out of the body.

 Statement II: Egestion is the process by which undigested food is thrown out of the body.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q11.  Saliva is the tongue a muscular organ attached to the floor of the mouth.

1. True

2.  False

Q12.  Read the following statements carefully:

 Statement I:  Touch is the tongue a muscular organ attached to the floor of the mouth.

 Statement II: Saliva is the tongue a muscular organ attached to the floor of the mouth.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q13.  Muscular organ attached to the floor of the mouth is the tongue.

1. True

2.  False

Q14.  Read the following statements carefully:

 Statement I:  Salivary gland is the tongue.

 Statement II: Muscular organ attached to the floor of the mouth is the tongue.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q15.  Saliva is secreted by the salivary glands.

1. True

2.  False

Q16.  Read the following statements carefully:

 Statement I:  Tears is secreted by the salivary glands.

 Statement II: Saliva is secreted by the salivary glands.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q17.  Saliva is secreted by the salivary glands.

1. True

2.  False

Q18.  Read the following statements carefully:

 Statement I:  Blood is secreted by the salivary glands.

 Statement II: Saliva is secreted by the salivary glands.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q19.  Oesophagus is the long tube from the pharynx called.

1. True

2.  False

Q20.  Read the following statements carefully:

 Statement I:  Large intestine is the long tube from the pharynx called.

 Statement II: Oesophagus is the long tube from the pharynx called.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q21.  Villi are the folds in the inner wall of the small intestine called.

1. True

2.  False

Q22.  Read the following statements carefully:

 Statement I:  Teeth are the folds in the inner wall of the small intestine called.

 Statement II: Villi are the folds in the inner wall of the small intestine called.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q23.  Water is absorbed in the large intestine.

1. True

2.  False

Q24.  Read the following statements carefully:

 Statement I:  Food is absorbed in the large intestine.

 Statement II: Water is absorbed in the large intestine.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q25.  Rumen is the part of the stomach that cows, buffaloes and other grass-eating animals store grass in.

1. True

2.  False

Q26.  Read the following statements carefully:

 Statement I:  Abomasum is the part of the stomach that cows, buffaloes and other grass-eating animals store grass in.

 Statement II: Rumen is the part of the stomach that cows, buffaloes and other grass-eating animals store grass in.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q27.  Cellulose is digested by the action of certain bacteria which are not present in humans.

1. True

2.  False

Q28.  Read the following statements carefully:

 Statement I:  Protein is digested by the action of certain bacteria which are not present in humans.

 Statement II: Cellulose is digested by the action of certain bacteria which are not present in humans.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q29.  Caecum is the large sac-like structure between the oesophagus and the small intestine called.

1. True

2.  False

Q30.  Read the following statements carefully:

 Statement I:  Stomach is the large sac-like structure between the oesophagus and the small intestine called.

 Statement II: Caecum is the large sac-like structure between the oesophagus and the small intestine called.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q31.  The cellulose of the food is digested by the action of certain bacteria.

1. True

2.  False

Q32.  Read the following statements carefully:

 Statement I:  The cellulose of the food is digested by the action of the stomach.

 Statement II: The cellulose of the food is digested by the action of certain bacteria.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q33.  _________ is the term for the inner wall of the small intestine.

1. True

2.  False

Q34.  Read the following statements carefully:

 Statement I:  Rectum is the term for the inner wall of the small intestine.

 Statement II: _________ is the term for the inner wall of the small intestine.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q35.  The inner wall of the small intestine has many finger-like outgrowths.

1. True

2.  False

Q36.  Read the following statements carefully:

 Statement I:  The bladder has many finger-like outgrowths.

 Statement II: The inner wall of the small intestine has many finger-like outgrowths.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q37.  Villi is the location and function of the small intestine.

1. True

2.  False

Q38.  Read the following statements carefully:

 Statement I:  The small intestine is a long, coiled tube that is about 20 feet long and is located in the center of the abdomen. it is responsible for breaking down food and absorbing nutrients and water. is the location and function of the small intestine.

 Statement II: Villi is the location and function of the small intestine.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q39.  Bile is produced in villi.

1. True

2.  False

Q40.  Read the following statements carefully:

 Statement I:  Saliva is produced in villi.

 Statement II: Bile is produced in villi.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q41.  Killing of bacteria is a part of the digestive canal involved in.

1. True

2.  False

Q42.  Read the following statements carefully:

 Statement I:  Saliva production is a part of the digestive canal involved in.

 Statement II: Killing of bacteria is a part of the digestive canal involved in.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q43.  Complete digestion of food is ________________.

1. True

2.  False

Q44.  Read the following statements carefully:

 Statement I:  No digestion of food is ________________.

 Statement II: Complete digestion of food is ________________.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

Q45.  Faeces is formed when food is digested in amoeba.

1. True

2.  False

Q46.  Read the following statements carefully:

 Statement I:  Air is formed when food is digested in amoeba.

 Statement II: Faeces is formed when food is digested in amoeba.

 Which of the following option is correct:

1. Both Statements are False.

2. Statement I is True and Statement II is False.

3. Statemet II is True.

4. Both Statements are True.

MCQ. Fillups (19 Questions)

Q1. _________ is the taking in of food

1. Respiration

2. Ingestion 

3. Elimination

4. Excretion

Q2. _________ is the process of breaking down of food into simple, soluble molecules

1. Excretion

2. Circulation

3. Digestion 

4. Respiration

Q3. _________ is the process by which digested food enters the blood

1. Ingestion

2. Absorption 

3. Secretion

4. Excretion

Q4. _________ is the process by which the food carried by the blood is utilised by the body

1. Assimilation 

2. Digestion

3. Elimination

4. Respiration

Q5. _________ is the process by which undigested food is thrown out of the body

1. Defecation

2. Digestion

3. Excretion

4. Egestion 

Q6. _________ is the tongue a muscular organ attached to the floor of the mouth

1. Saliva 

2. Touch

3. Smell

4. Taste

Q7. _________ is the tongue

1. Teeth

2. Muscular Organ Attached To The Floor Of The Mouth 

3. Esophagus

4. Salivary Gland

Q8. _________ is secreted by the salivary glands

1. Blood

2. Saliva 

3. Sweat

4. Tears

Q9. _________ is secreted by the salivary glands

1. Sweat

2. Saliva 

3. Tears

4. Blood

Q10. _________ is the long tube from the pharynx called

1. Stomach

2. Large Intestine

3. Oesophagus 

4. Small Intestine

Q11. _________ are the folds in the inner wall of the small intestine called

1. Teeth

2.  Fingers

3. Gills

4. Villi 

Q12. _________ is absorbed in the large intestine

1. Food

2. Bacteria

3. Air

4. Water 

Q13. _________ is the part of the stomach that cows, buffaloes and other grass-eating animals store grass in

1. Reticulum

2. Abomasum

3. Omasum

4. Rumen 

Q14. _________ is digested by the action of certain bacteria which are not present in humans

1. Carbohydrate

2. Cellulose 

3. Protein

4. Lipid

Q15. _________ is the large sac-like structure between the oesophagus and the small intestine called

1. Rectum

2. Stomach

3. Large Intestine

4. Caecum 

Q16. The cellulose of the food is digested by the action of _________

1. The Large Intestine

2. Certain Bacteria 

3. The Small Intestine

4. The Stomach

Q17. _________ has many finger-like outgrowths

1. The Bladder

2. The Outer Wall Of The Small Intestine

3. The Stomach

4. The Inner Wall Of The Small Intestine 

Q18. _________ is the location and function of the small intestine

1. The Small Intestine Is A Long, Coiled Tube That Is About 20 Feet Long And Is Located In The

2. The Small Intestine Is A Long, Coiled Tube That Is About 20 Feet Long And Is Located In The Center Of The Abdomen. It Is Responsible For Breaking Down Fo

Q19. _________ is formed when food is digested in amoeba

1. Faeces 

2. Air

3. Water

4. Food Vacuole 

Cleanliness

 Cleanliness is a very important habit used in our daily lives. It is taught by our parents since our childhood. When we talk about cleanliness we might just think about keeping ourselves and our houses clean but almost nobody is even bothered to look for a dustbin for throwing garbage. Urination in open makes our environment dirty and foul smelling, spitting here and there again makes our surroundings dirty, we throw garbage here and there without thinking that others might step on it. Then germs and flies are attracted to it and carry the germs wherever they go. Then they sit on our food, and when we eat it the germs go inside our body resulting in dangerous diseases like Cholera , Typhoid fever, Malaria, Diarrhoea  etc.  Some diseases are also caused due to air and water, because of the pollutants thrown by the factories in the air and water without treating it in waste treatment plants. Factories are also a major contributing source to water and air pollution. Illegal dumping of hazardous chemicals, gases, contaminated water in waterways damages the marine life and our environment also, and sometimes this negligence results in harmful diseases like Chronic Obstructive Pulmonary Disease (COPD), Asthma,  and lung cancer etc. from air pollution Dysentery, Polio, Trachoma etc. ( Trachoma can lead to visual impairment or blindness) are some diseases that occur because of dirty water. T o prevent these type of diseases and for keeping our environment clean we must follow these steps and don't forget those 4 R's Refuse, Reduce, Reuse and Recycle.

* Reduce the use of single use plastics.

* Do not litter here and there.

* Do not spit here and there.

* Put off the lights when not in use.

*Put off the flowing taps.

*Use public transport or car pool while travelling.

[ays_quiz id="8"]

Acid, bases and salts(QNA)

 

Q1 What is an Acid-base indicator? Give one example.

Ans There are some special substances that have different colors in acidic and basic mediums. They are called acid base indicators. Litmus is a natural indicator obtained from Lichens.

 

Q2 Name one each of acidic and basic substances.

Ans Carbonic acid(H2CO3) is one of the acidic substances, baking soda is one of the bases.

 

Q How can carbon di oxide be prepared from an acid?

Ans The reaction of sodium carbonate with sulphuric acid is used to prepare carbon di oxide in laboratory.

 

Q4 Give two examples each of strong acids and weak acids.

Ans the two examples of strong acids are sulphuric acid(H2So4), Nitric Acid (HNO3) and two examples of weak acids are citric acid and lactic acid.

 

Q5 Why does the base applied to your skin give relief from an ant bite?

Ans When an ant stings, it injects formic acid into the skin. This irritates the skin baking soda or calamine solutions (Zinc carbonate) is used to neutralize the acid and provide relief.

 

Q6 Give two main usage each of the following.

 

a) Sulphuric acid: Automobile batteries, detergent manufacturing

b) Hydrochloric acid: Chemical manufacturing such as glue, to purify salts

c)Nitric acid: To prepare aqua Regia, to extract some metals from there ores.

 

Q7 Some acids are dangerous, others are not. Explain , giving examples.

Ans: Acids obtained from minerals are mineral acids. examples are hydrochloric acid(HCl), Sulphuric acid(H2So4),Nitric acid(HNO3), Carbonic acid(H2Co3). Most mineral acids are strong. They can cause serious skin burns.

Acids obtained from living things such as plants and animals are organic acids. Most organic acids are weak. Examples are citric acid, lactic acid, malic acid and carbonic acid etc.

  

Q8 What are bases? What are their physical properties?

Ans Substances such as baking soda that are bitter in taste and feel soapy to touch are bases. A base has chemically opposite properties as compared to an acid. Thus, a base can neutralize acid's acidity.

Q9 How can we make soap in laboratory?

Ans Take 20 ml of castor oil in beaker other oils such as coconut oil can also be used. Prepare sodium hydroxide solution (NaoH) by dissolving half a tea spoon of caustic soda in about 20 ml of water mix the oil and sodium hydroxide solution. Heat the mixture continuously and let it boil for 10 to 15 minutes continuously. The reaction that occurs

Oil + NaoH= Soap + Glycerin

To separate the soap from the soap mixture. Add a tea spoon full of salt to the beaker and stir. On cooling, solid soap separates out as a crust on the top of the solution.

 

 

 

 

 

 

 

Natural Oxygen Cylinders - Trees

A tree is like a saint and great giver to human kind. it is a living being and act as a natural oxygen cylinder as we know that trees inhale carbon -di-oxide and give out oxygen which we breath. Not only that trees make our environment pollution free and reduce global warming. Life is impossible without trees but after knowing this all we are still destroying forests and cutting down trees and after that all if those homeless animals roam on our streets. we complain about their presence. Man has always been exploiting mother nature for his selfish interest. It is startling that we humans cut 2.47 million trees every day and planting only 5000 trees. On an average it takes 5 minutes to cut a tree but 10 to 20 years to grow. If this continues further then atmosphere will have only toxic gases and smog. We may need oxygen dispenser for breathing. Is it viable? Average life of human being will be reduced to few years. To this very day what distinguishes human from the rest of living kingdom is intelligence. Still this intelligent creature is weakening its own existence by exploiting and disturbing the fine ecological balance.

Sketching Soulmates for Lonely Souls

We all need like minded people around us. We daily find ourself in crowd. Lot of people are around us. Are we connected with them heart to heart? There must me few people around us who we connect most frequently. Human beings are born to be social and well connected race. We see solace in the company of like minded people. I wish to know how nice would it be if we can get a handmade potrait of someone who may walk in our life. How exciting would it be to see the sketch of your partner. Do affirmation for the right partner. Sketch it now

Grade VIII- Math Concept Maps

 

Credit

Maths Concept Map 8 CBSE by Nilesh Gupta

Grade IX Math Concept Maps

 

Credit

Maths Concept Map 9 CBSE by Nilesh Gupta

Grade X - Concept Maps

Very helpful for quick revision

Credit and thanks: Nilesh Gupta, Scribd

Maths Concept Map_X CBSE by Nilesh Gupta

Polynomials

Quick Revision Polynomials

1. Polynomials of degrees 1, 2 and 3 are called linear, quadratic and cubic polynomials respectively.

2. A quadratic polynomial in $x$ with real coefficients is of the form $a x^{2}+b x+c,$ where $a, b$, $c$ are real numbers with $a \neq 0$

3. The zeroes of a polynomial $p(x)$ are precisely the $x$ -coordinates of the points, where the graph of $y=p(x)$ intersects the $x$ -axis.

4. A quadratic polynomial can have at most 2 zeroes and a cubic polynomial can have at most 3 zeroes.

5. If $\alpha$ and $\beta$ are the zeroes of the quadratic polynomial $a x^{2}+b x+c,$ then

$\alpha+\beta=-\frac{b}{a}, \quad \alpha \beta=\frac{c}{a}$

6. If $\alpha, \beta, \gamma$ are the zeroes of the cubic polynomial $a x^{3}+b x^{2}+c x+d=0,$ then

$\alpha+\beta+\gamma=\frac{-b}{a} \alpha \beta+\beta \gamma+\gamma \alpha=\frac{c}{a}$

and $\alpha \beta \gamma=\frac{-d}{a}$

7. The division algorithm states that given any polynomial $p(x)$ and any non-zero polynomial $g(x)$, there are polynomials $q(x)$ and $r(x)$ such that

p(x)=g(x) q(x)+r(x)

where $\quad r(x)=0$ or degree $r(x)<$ degree $g(x)$

Real Number Theorems

Quick revision for theorems

Theorem 1.1 (Euclid’s Division Lemma) : Given positive integers a and b,

there exist unique integers q and r satisfying a = bq + r, 0 ≤ r < b.

Theorem 1.2 (Fundamental Theorem of Arithmetic) : Every composite number

can be expressed ( factorised) as a product of primes, and this factorisation is

unique, apart from the order in which the prime factors occur.

Theorem 1.3: Let $p$ be a prime number. If $p$ divides $a^{2},$ then $p$ divides a, where $a$ is a positive integer.

Theorem 1.4: $\sqrt{2}$ is irrational.

Theorem 1.5: Let $x$ be a rational number whose decimal expansion terminates.

Then $x$ can be expressed in the form $\frac{p}{q},$ where $p$ and $q$ are coprime, and the

prime factorisation of $q$ is of the form $2^{\circ} 5^{m},$ where $n, m$ are non-negative integers.

Theorem 1.6: Let $x=\frac{p}{q}$ be a rational mamber, such that the prime factorisation of $q$ is of the form $2^{n} 5^{\text {" }},$ where $n, m$ are non-negative integers. Then $x$ has a

decimal expansion which terminates.

Theorem 1.7: Let $x=\frac{p}{q}$ be a rational number, such that the prime factorisation of $q$ is not of the form $2^{n} 5$ ", where $n, m$ are non-negative integers. Then, $x$ has a decimal expansion which is non-terminating repeating (recurring).

So we can conclude that the decimal expansion of every rational number is either terminating or non-terminating repeating.