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NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals
Edited By Irshad Anwar | Updated on May 22, 2025 10:51 AM IST
Chapter 2, Nutrition in Animals, describes how animals ingest and use food to exist. The question and answer section of the chapter also helps students in understanding important subjects like various methods of obtaining food in animals, human digestion, and the function of digestive enzymes. By using these explanations, students can develop a strong basic knowledge and prepare themselves properly for exams. NCERT Solutions can provide solutions for other classes as well in a very easy-to-understand way, which are prepared by experts.
This Story also Contains
- 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
- Approach to Solve Questions of Class 7 Science Chapter 2
- Important Question for Class 7 Science Nutrition in Animals
- NCERT Solutions for Class 7 Science Chapter-Wise
The solutions are given in simple language so that the concepts can be easily understood. Students can also download the NCERT Solutions for Class 7 in PDF format so that they can learn easily. As the solutions are prepared as per the current CBSE syllabus, the solutions are a trusted means of learning for students who wish to get high marks in exams. This makes the NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals an excellent study help.
Download PDF of NCERT Solutions for Class 7 Science Chapter 2: Nutrition in Animals
Students can download the PDF of Chapter 2 from the link below:-
NCERT Solutions for Class 7 Science Chapter 2 - Nutrition in Animals: Solved Exercise Questions:
The detailed solutions are given below-
(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.
(c) True, bile juice is stored in a sac called the gall bladder.
(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.
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 brokendown 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,a 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:
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
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 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
An 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.
Also, Check NCERT Books and NCERT Syllabus here
Approach to Solve Questions of Class 7 Science Chapter 2
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.
Important Question 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?
A. To produce digestive enzymes
B. To increase the surface area for absorption of digested food and absorb nutrients into the bloodstream
C. To store undigested food
D. To secrete mucus for lubrication
Correct Answer: B
Explanation:
Villi are tiny finger-like projections lining the small intestine that significantly increase its surface area, allowing for more efficient absorption of nutrients from digested food. Each villus contains blood vessels that transport absorbed nutrients directly into the bloodstream, facilitating their distribution throughout the body. This structure is essential for effective digestion and nutrient uptake.
NCERT Solutions for Class 7 Science Chapter-Wise
The chapterwise solutions are given below:
Frequently Asked Questions (FAQs)
1. What are the main steps of nutrition in humans?
The main steps of nutrition in humans are ingestion, digestion, absorption, assimilation, and egestion.
2. How does digestion occur in humans?
3. How do amoeba and other simple animals digest their food?
Amoeba takes in food by engulfing it through its cell membrane and digests it inside the food vacuole using enzymes.
4. What are the different modes of feeding in animals?
Animals have various modes of feeding such as chewing, sucking, sponging, capturing and swallowing, scraping, and siphoning, depending on their type and habitat.
5. What is the role of the liver in digestion?
The liver is the largest gland in the human body and it secretes bile juice which helps in the digestion of fats.
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).
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