NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals

Edited By Irshad Anwar | Updated on Apr 16, 2025 05:38 PM IST

NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals: The chapter provides a detailed understanding of how animals obtain and utilise food for survival. The question-answer section of Chapter 2 helps students understand essential concepts such as the different modes of nutrition, digestion in human beings and the role of digestive enzymes. The PDF format of the solutions of Nutrition in Animals offers well-explained answers to important textbook questions. Students can build a strong conceptual foundation by referring to these explanations. For finding the solutions book for any other class, NCERT Solutions will help you out.

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Download PDF of NCERT Solutions for Class 7 Science Chapter 2: Nutrition in Animals
NCERT Solutions for Class 7 Science Chapter 2 - Nutrition in Animals: Solved Exercise Questions:
Important Topics of NCERT Class 7 Science Chapter 2- Nutrition in Animals
How to solve NCERT Class 7 Science Chapter 2 questions effectively?
NCERT Chapter-Wise Solutions for Class 7th Science:
Practice Questions for Class 7 Science Nutrition in Animals

NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals

For a quick revision, the Nutrition in Animals Class 7 questions and answers section helps students read the chapter efficiently. The NCERT Solutions for Class 7 are written in simple language to improve concept clarity. Additionally, students can download the solutions in PDF format to study in their comfort. Since these solutions are similar to the latest CBSE syllabus, they prove a reliable resource for students aiming to score high in exams.

Download PDF of NCERT Solutions for Class 7 Science Chapter 2: Nutrition in Animals

Students can download the PDF of Chapter 2 from the below link:-

Download PDF

NCERT Solutions for Class 7 Science Chapter 2 - Nutrition in Animals: Solved Exercise Questions:

The detailed solutions are given below-

Q1. Fill in the blanks:

(a) The main steps of nutrition in humans are __________, __________, __________, _________ and __________.

(b) The largest gland in the human body is __________.

(c) The stomach releases hydrochloric acid and ___________ juices which act on food.

(d) The inner wall of the small intestine has many finger-like outgrowths called _________.

(e) Amoeba digests its food in the ____________ .

Answer: (a) The main steps of nutrition in humans are ingestion , digestion , absorption , assimilation and egestion .

(b) The largest gland in the human body is the liver.

(c) The stomach releases hydrochloric acid and digestive juices which act on food.

(d) The inner wall of the small intestine has many finger-like outgrowths called villi (singular villus) .

(e) Amoeba digests its food in the food vacuole.

Q2. Mark ‘T’ if the statement is true and ‘F’ if it is false:

(a) Digestion of starch starts in the stomach. (T/F)

(b) The tongue helps in mixing food with saliva. (T/F)

(c) The gall bladder temporarily stores bile. (T/F)

(d) The ruminants bring back swallowed grass into their mouth and chew it for some time. (T/F)

Answer:

(a) False, Digestion of carbohydrates, like starch, begins in the buccal cavity.

(b) True, The saliva breaks down the starch into sugars.

(d) True, In ruminants, bacteria present in the rumen help in the digestion of cellulose.

Q3. Tick mark the correct answer to the following question:

(a) Fat is completely digested in the

(i) stomach

(ii) mouth

(iii) small intestine

(iv) large intestine

Answer: (a) Fat is completely digested in the

(iii) small intestine

Q3. Tick mark the correct answer to the following question:

b) Water from the undigested food is absorbed mainly in the

(i) stomach

(ii) food pipe

(iii) small intestine

(iv) large intestine

Answer: (b) Water from the undigested food is absorbed mainly in the

(iv) large intestine.

Q4. Match the items of Column I with those given in Column II:

Column I Column II

Food components Product(s) of digestion

Carbohydrates Fatty acids and glycerol

Proteins Sugar

Fats Amino acids

Answer:

Column I	Matched Column II
Food components	Product(s) of digestion
Carbohydrates	Sugar
Proteins	Amino acids
Fats	Fatty acids and glycerol

Q5. What are villi? What is their location and function?

Answer: The inner walls of the small intestine have thousands of finger-like outgrowths. These are called villi (singular villus).

The villi increase the surface area for absorption of the digested food. The surface of the villi absorbs the digested food materials. The absorbed substances are transported via the blood vessels to different organs of the body where they are used to build complex substances such as the proteins required by the body. This is called assimilation.

Q6. Where is the bile produced? Which component of the food does it help to digest?

Answer: The liver secretes bile juice that is stored in a sac called the gall bladder.

The bile plays an important role in the digestion of fats.

Q7. Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.

Answer: Cellulose is the type of carbohydrate that can be digested by ruminants but not by humans because the cellulose of the food is digested by the action of certain bacteria which are not present in humans.

Q8. Why do we get instant energy from glucose?

Answer: Carbohydrates get broken into simple sugars like glucose.

In the cells, glucose breaks down with the help of oxygen into carbon dioxide and water, and it easily get absorbed in the blood hence we get instant energy from glucose.

Q9. Which part of the digestive canal is involved in:

(i) absorption of food ________________.

(ii) chewing of food ________________.

(iii) killing of bacteria ________________.

(iv) complete digestion of food ________________.

(v) formation of faeces ________________.

Answer: (i) absorption of food small intestine.

(ii) chewing of food buccal cavity.

(iii) the killing of bacteria stomach.

(iv) complete digestion of food small intestine.

(v) formation of faeces large intestine.

Q10. Write one similarity and one difference between the nutrition in amoeba and human beings.

Answer: The similarity between the nutrition in amoeba and human beings is that both are heterotrophs, they derive their nutrition from other organisms.

The dissimilarity between them is that human beings have a complex digestive system where food gets digested in separate regions while in amoeba food is digested in a food vacuole.

Q11. Match the items in Column I with suitable items in Column II

Column I Column II

(a) Salivary gland (i) Bile juice secretion

(b) Stomach (ii) Storage of undigested food

(c) Liver (iii) Saliva secretion

(d) Rectum (iv) Acid release

(e) Small intestine (v) Digestion is completed

(f ) Large intestine (vi) Absorption of water

(vii) Release of faeces

Answer: Matched items of column I with column II :

Column I	Column II
(a) Salivary gland	(iii) Saliva secretion
(b) Stomach	(iv) Acid release
(c) Liver	(i) Bile juice secretion
(d) Rectum	(vii) Release of faeces
(e) Small intestine	(v) Digestion is completed
(f) Large intestine	(vi) Absorption of water

Q12. Label Fig. 2.11 of the digestive system

Answer: The labelled diagram is shown in the figure below:

Alimentary canal

Q13. Can we survive only on raw, leafy vegetables/grass?

Answer: No, we cannot survive only on raw, leafy vegetables, or grass. This is because humans are not able to digest the cellulose present in grass or leafy vegetables due to the absence of cellulose-digesting enzymes.

NCERT Solutions for Class 7 - Subject Wise

NCERT Solutions for Class 7 Maths

NCERT Solutions for Class 7 Science

Important Topics of NCERT Class 7 Science Chapter 2- Nutrition in Animals

Important Topics in Class 7 Science Chapter 2 Nutrition in Animals are given below-:

2. Nutrition in Animals

Animals cannot make their own food like plants, so they depend on other organisms for food and nutrition. They consume food and digest it to obtain energy and nutrients for survival.

2.1 Different Ways of Taking Food

Different animals have different ways of taking in food. Some like cows and buffaloes, chew grass, while others, like snakes, swallow their prey whole. Insects like butterflies use a proboscis to suck nectar, while frogs use their sticky tongues to catch insects.

2.2 Digestion in Humans

Humans have a complex digestive system that includes the mouth, oesophagus, stomach, small intestine, large intestine, and anus. Food is broken down into simpler substances by enzymes and digestive juices. Nutrients are absorbed in the small intestine, residual water by the large intestine, and the undigested material is passed through the anus.

2.3 Digestion in Grass-Eating Animals

Grass-eating animals, like cows and deer, have a special stomach with four chambers to help digest tough plant material like cellulose. They first swallow the food and later bring it back to their mouths for chewing again (rumination), and then digest it completely. These animals are called ruminants.

2.4 Feeding and Digestion System of Amoeba

Amoeba is a unicellular organism that feeds using pseudopodia (false feet). It surrounds the food particle, forming a food vacuole, where digestion takes place with the help of enzymes. The digested nutrients are absorbed, and the waste is expelled by the body by a process called phagocytosis.

How to solve NCERT Class 7 Science Chapter 2 questions effectively?

The students should first have a clear understanding of the different stages involved in animal nutrition, including ingestion, digestion, absorption, assimilation and egestion. It is important to study the key terms and processes, like the role of digestive enzymes, the function of villi and the unique digestive system of ruminants. Having properly labelled diagrams of the human digestive system will help in strengthening visual memory. Also, practising the NCERT exemplar questions and activities will improve accuracy and confidence in writing exam answers.

NCERT Chapter-Wise Solutions for Class 7th Science:

The chapter-wise NCERT solutions for all the chapters in biology are given below:

NCERT Solutions for Class 7 Biology Chapter 1 Nutrition in Plants

NCERT Solutions for Class 7 Biology Chapter 2 Nutrition in Animals

NCERT Solutions for Class 7 Biology Chapter 3 Heat

NCERT Solutions for Class 7 Biology Chapter 4 Acids, Bases and Salts

NCERT Solutions for Class 7 Biology Chapter 5 Physical and Chemical Changes

NCERT Solutions for Class 7 Biology Chapter 6 Respiration in Organisms

NCERT Solutions for Class 7 Biology Chapter 7 Transportation in Animals and Plants

NCERT Solutions for Class 7 Biology Chapter 8 Reproduction in Plants

NCERT Solutions for Class 7 Biology Chapter 9 Motion and Time

NCERT Solutions for Class 7 Biology Chapter 10 Electric Current and its Effects

NCERT Solutions for Class 7 Biology Chapter 11 Light

NCERT Solutions for Class 7 Biology Chapter 12 Forests: Our Lifeline

NCERT Solutions for Class 7 Biology Chapter 13 Wastewater Story

Practice Questions for Class 7 Science Nutrition in Animals

Below are a few solved practice questions:

Q1. What is the function of villi in the small intestine?

Answer:

The villi help in increasing the surface area for the absorption of digested food. They contain blood vessels that help absorb nutrients into the bloodstream.

Q2. What is rumination?

Answer:

Rumination is the process by which the partly digested food (cud) returns to the mouth from the stomach for re-chewing in ruminants like cows and buffaloes

Q3. How does the stomach help in digestion?

Answer:

The stomach secretes, digestive juices, including hydrochloric acid and enzymes, which help in breaking down proteins and other macronutrients and also help in killing the germs in the food.

Q4. Name the organs involved in the human digestive system.

Answer:

The organs involved in the human digestive system are the mouth, oesophagus, stomach, small intestine, large intestine, rectum, and anus.

Q5. Why is the small intestine longer than the large intestine?

Answer:

The small intestine is longer to provide a larger surface area for the absorption of nutrients from the digested food.

Q6. What is the role of saliva in digestion?

Answer:

The saliva contains the enzyme salivary amylase, which helps in the digestion of starch in the mouth. The digestion of food also starts in the mouth because of saliva.

Q7. How is digestion in Ameoba different from humans?

Answer:

Amoeba uses pseudopodia to help capture food and digest it inside its food vacuole. Humans, on the other hand, have complex digestive systems with specialised organs for each step of digestion.

The NCERT Solutions for Class 7 Science covers all the chapters in an easy-to-understand format. The question and answer section covers important topics such as holozoic nutrition, digestion in amoeba and the role of various organs in the human digestive system. The Solutions for Chapter 2 Nutrition in Animals explains the process of nutrition including human digestion. The answers provide step-by-step explanations for all the NCERT textbook exercises. They serve as an excellent resource for revision and help students have a stronghold of their concepts for better performance in exams.

Also, Check NCERT Books and NCERT Syllabus here

We hope you will ace your examination with the help of NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals.

Frequently Asked Questions (FAQs)

1. What is animal nutrition Class 7?

Animal nutrition refers to the process by which an animal consumes food and uses it in its body. In spite of the fact that plants can make their own food through the process of photosynthesis, animals must obtain their food from plants either directly by eating them or indirectly by eating other animals that consume them.

2. Name the heterotrophic nutrition in animal and plants.

There are 4 types of heterotrophic nutrition

Saprozoic, Holozoic, Mutualistic, Parasitic

3. How many questions in NCERT Solutions Class 7 Science chapter 2 ?

There are 13 Questions in NCERT Solutions Class 7 Science chapter 2

4. What is the function of the tongue in the digestive process?

The tongue plays a crucial role in digestion by facilitating food movement, mixing it with saliva, and initiating swallowing, while also enabling taste perception and speech.

5. How do teeth help in digestion? Explain different types of teeth.

Teeth are crucial for digestion as they physically break down food into smaller pieces, making it easier to swallow and digest. Humans have four types of teeth: incisors for biting, canines for tearing, premolars for crushing, and molars for grinding.

6. What is the role of saliva in digestion?

Saliva contains special enzymes that help digest the starches in your food. An enzyme called amylase breaks down starches (complex carbohydrates) into sugars, which your body can more easily absorb. Saliva also contains an enzyme called lingual lipase, which breaks down fats.

7. What are villi? What is their role in the small intestine?

Villi are tiny, finger-like projections on the inner wall of the small intestine that significantly increase its surface area, facilitating efficient absorption of nutrients from digested food into the bloodstream.

8. How is food pushed forward in the alimentary canal?

Food moves through the alimentary canal via a process called peristalsis, which involves rhythmic, wave-like contractions of the digestive tract's muscles, propelling food forward.

9. What is the role of stomach in digestion?

The stomach plays a crucial role in digestion by storing food, mixing it with acidic gastric juices and enzymes, and initiating the breakdown of proteins, before passing the partially digested food (chyme) to the small intestine.

10. What are digestive enzymes? Give examples.

Digestive enzymes are proteins that speed up the breakdown of food molecules, and examples include amylase (for carbohydrates), protease (for proteins), and lipase (for fats).

Also Read

NCERT Solutions for Class 7 Maths Chapter 9 Perimeter and Area

NCERT Solutions for Class 7 Maths Chapter 2 Fractions and Decimals

NCERT Solutions for Class 7 Maths Chapter 1 Integers

NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals

NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants

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Option 1) $0.34\; J$	Option 2) $0.16\; J$
Option 3) $1.00\; J$	Option 4) $0.67\; J$

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times. Assume that the potential energy lost each time he lowers the mass is dissipated. How much fat will he use up considering the work done only when the weight is lifted up ? Fat supplies 3.8×10⁷J of energy per kg which is converted to mechanical energy with a 20% efficiency rate. Take g = 9.8 ms⁻² :

Option 1)

2.45×10⁻³ kg

Option 2)

6.45×10⁻³ kg

Option 3)

9.89×10⁻³ kg

Option 4)

12.89×10⁻³ kg

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Option 1) $2,000 \; J - 5,000\; J$	Option 2) $200 \, \, J - 500 \, \, J$
Option 3) $2\times 10^{5}J-3\times 10^{5}J$	Option 4) $20,000 \, \, J - 50,000 \, \, J$

A particle is projected at 60⁰ to the horizontal with a kinetic energy $K$ . The kinetic energy at the highest point

Option 1) $K/2\,$	Option 2) $\; K\;$
Option 3) $zero\;$	Option 4) $K/4$

In the reaction,

$2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}$

Option 1) $11.2\, L\, H_{2(g)}$ at STP is produced for every mole $HCL_{(aq)}$ consumed	Option 2) $6L\, HCl_{(aq)}$ is consumed for ever $3L\, H_{2(g)}$ produced
Option 3) $33.6 L\, H_{2(g)}$ is produced regardless of temperature and pressure for every mole Al that reacts	Option 4) $67.2\, L\, H_{2(g)}$ at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, $Mg_{3}(PO_{4})_{2}$ will contain 0.25 mole of oxygen atoms?

Option 1) 0.02	Option 2) 3.125 × 10^-2
Option 3) 1.25 × 10^-2	Option 4) 2.5 × 10^-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1) decrease twice	Option 2) increase two fold
Option 3) remain unchanged	Option 4) be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1) Molality	Option 2) Weight fraction of solute
Option 3) Fraction of solute present in water	Option 4) Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol^-1) is

Option 1) twice that in 60 g carbon	Option 2) 6.023 × 10²²
Option 3) half that in 8 g He	Option 4) 558.5 × 6.023 × 10²³

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t²) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m² , the number of rotations made by the pulley before its direction of motion if reversed, is