NCERT Solutions Class 7 Science Chapter 2 - Nutrition in Animals

Class 7 Science Chapter 2 Nutrition in Animals explains how animals obtain and utilize nutrients for energy and growth. The chapter covers different modes of nutrition, such as herbivorous, carnivorous, and omnivorous diets, along with a detailed look at the human digestive system and its functioning. 

It is important for students to solve Class 7 Science Chapter 2 Nutrition in Animals Question Answers, as it helps them gain a deeper understanding of the concepts and enhances their ability to apply this knowledge in various contexts. Regular practice also improves accuracy and performance in exams, as it reinforces learning and clarifies any doubts related to the digestion process and nutrition in animals. For this, the best practice tool is NCERT Solutions Class 7 Science, as it provides detailed answers to all the questions in the NCERT textbook, helping students grasp the concepts thoroughly and excel in their studies.

In this article, you can find step-by-step solutions curated by some of India’s best subject-matter experts from ALLEN, who have taught thousands of students over the years for various competitive exams.

1.0Download Class 7 Science Chapter 2 NCERT Solutions PDF Online

You can also download these solutions as their are available in the pdf format below: 

2.0What Will Students Learn in Chapter 2: Nutrition in Animals?

• Modes of animal nutrition depending on the types of food: for example, herbivores, carnivores and omnivores.
• Structure and functioning of the human digestive system, covering the processes of ingestion, digestion, absorption and assimilation.
• How nutrition is implemented in other species of organisms such as ruminants, and also certain unicellular organisms.
• Nutrients functions with respect to energy production, body growth and maintenance.
• Different organisms exhibit different feeding patterns.

3.0NCERT Questions with Solutions for Class 7 Science Chapter 2 - Detailed Solutions

• 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 _______. Ans. (a) ingestion, digestion, absorption, assimilation and egestion (b) liver (c) digestive (d) villi (e) food vacuole
• 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) Ans. (a) Digestion of starch starts in the stomach. (F) (b) The tongue helps in mixing food with saliva. (T) (c) The gall bladder temporarily stores bile. (T) (d) The ruminants bring back swallowed grass into their mouth and chew it for some time. (T)
• Tick mark the correct answer in each of the following (a) Fat is completely digested in the - (i) stomach (ii) mouth (iii) small intestine (iv) large intestine Ans. (iii) small intestine (b) Water from the undigested food is absorbed mainly in the - (i) stomach (ii) food pipe (iii) small intestine (iv) large intestine Ans. (iv) large intestine
• Match the items of Column I with those given in Column II:

Ans.

• What are villi? What is their location and function? Ans. Villi are tiny finger-like projections originating from the walls of the small intestine. They increase the surface area for absorption of the digested food. The blood vessels present inside the villi can absorb the nutrients from the digested food.
• Where is the bile produced? Which component of the food does it help to digest? Ans. Liver produces the bile juice which is stored in the gall bladder. Bile plays an important role in the digestion of fats.
• Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also. Ans. Cellulose is a type of carbohydrate that can be digested by ruminants and not by humans. Ruminants have a large sac- like structure between small and large intestine where the food containing cellulose is digested by the action of certain bacteria. On the other hand, humans cannot digest cellulose, as the cellulose digesting enzymes are absent in them.
• Why do we get instant energy from glucose? Ans. Glucose is a simple sugar. Complex carbohydrates, when consumed, have to be digested into glucose. As glucose can be easily absorbed in blood, it provides energy to the body. Hence, when glucose is directly taken, it does not have to be digested and thus acts as an instant source of energy.
• 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 _. Ans. (i) small intestine (ii) buccal cavity (iii) stomach (iv) small intestine (v) large intestine
• Write one similarity and one difference between the nutrition in Amoeba and human beings. Ans. Similarity between nutrition in Amoeba and human beings: Both Amoeba and humans require energy for the growth and maintenance of their bodies. This energy is derived from the food that they eat. The food that they consume is always in a complex form and is therefore broken down into simpler forms by the process of digestion. Hence, both these organisms are heterotrophs. Differences between nutrition in Amoeba and human beings:

• Match the items of Column - I with suitable items in Column - II.

Ans. (a) - (iii), (b) - (iv), (c) - (i), (d) - (ii), € (v), (f) - (vi)

• Label the following figure of the digestive system.

• A part of human digestive system Ans.
• Can we survive only on raw, leafy vegetables/grass? Discuss. Ans. No, humans cannot survive only on raw, leafy vegetables or grass. It is because the grass is rich in cellulose, which is a type of carbohydrate that humans are not able to digest due to the absence of cellulose-digesting enzymes.