Hi friends. Here we provide the best possible answers to questions of class 7 science chapter 2 – Nutrition in Animals. Class 7 Science Chapter 2 Question Answer is also available in pdf format in both Hindi and English to download and save on your devices. Students can share this class 7 science ch 2 question answer with their friends.
These solutions will be very helpful for all. Students can avail themselves of simple explanations to the topic Nutrition in Animals in Hindi from our website.
Students who want to understand the topic ” Nutrition in Animals in Hindi”, please read Nutrition in Animals – प्राणियों मे पोषण and Nutrition in Humans and their digestive system in Hindi.
Here start with NCERT Solutions for Class 7 Science Chapter 2 – Nutrition in Animals
Class 7 Science ch 2 Question Answer | Ncert Solutions
Question 1:
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 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.
(e) Amoeba digests its food in the food vacuole.
Question 2:
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 (Right Answer: Digestion of starch starts in the mouth.)
(b) True
(c) True
(d) True
Question 3:
(a) Choose the correct answer from the following: Fat is completely digested in the (i) stomach (ii) mouth (iii) small intestine (iv) large intestine
Answer:
Fat is completely digested in the small intestine.
(b) Choose the correct answer from the following: Water from the undigested food is absorbed mainly in the (i) stomach (ii) food-pipe (iii) small intestine (iv) large intestine
Answer:
Water from the undigested food is absorbed mainly in the large intestine.
Question 4:
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 | Column- II |
| Food components | Product(s) of digestion |
| Carbohydrates | Sugar |
| Proteins | Amino acids |
| Fats | Fatty acids and glycerol |
What are villi? What are their location and function?
Answer:
Villi are the finger-like projections present in the inner wall of the small intestine of our digestive system. The main function of villi is to absorb digested food materials like glucose, fatty acid and amino acid. The villi increase the surface area so that absorption of the digested food becomes easier.
Where is the bile produced? Which component of the food does it help to digest?
Answer:
Bile juice is produced by the liver (the largest gland of the human digestive system) and stored in the Gallbladder. It helps in the digestion of fats present in food.
Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.
Answer:
Cellulose is a carbohydrate that can be digested by ruminants, but not by humans.
Reason: Cellulose is a complex substance and very difficult to digest. Ruminants have a type of bacteria present in the rumen that helps in the digestion of Cellulose. Humans don’t have such types of bacteria and enzymes that can help in digestion of the cellulose.
Why do we get instant energy from glucose?
Answer:
Glucose is a simple sugar and a subcategory of carbohydrates. It is not required to be broken further for absorption in our body. It is easily absorbed by the blood vessels to produce instant energy.
Question 9:
(i) Which part of the digestive canal is involved in absorption of food?
Answer: Small intestine
(ii) Which part of the digestive canal is involved in chewing food?
Answer: Buccal cavity
(iii) Which part of the digestive canal is involved in killing bacteria?
Answer: Stomach
(iv) Which part of the digestive canal is involved in complete digestion of food?
Answer: Small intestine
(v) Which part of the digestive canal is involved in the formation of faeces?
Answer: Large Intestine
What is similarity and difference between nutrition in amoeba and human beings?
Answer:
Similarity: The digestive systems of both Amoeba and human beings secrete digestive juices that act on food and break into simpler substances.
The type of nutrition in amoeba and human beings is common. That is holozoic nutrition which occurs in several stages like ingestion, digestion, absorption, assimilation, egestion.
Difference: Humans take food through the buccal cavity. The way of taking food in humans is chewing and swallowing. Digestion of food in humans occurs in stages in various compartments of the digestive tract like the Buccal cavity, Stomach, and Small intestine.
Whereas amoeba ingests food through their pseudopodia or false feet. The way of taking food in amoeba is Capturing. Amoeba digests food in its food vacuoles.
Question 11:
Match the items of Column I with suitable items in Column II.
| Column-I | Column-II |
| Salivary gland | Bile juice secretion |
| Stomach | Storage of undigested food |
| Liver | Saliva secretion |
| Rectum | Acid release |
| Small intestine | Digestion is completed |
| Large intestine | Absorption of water |
| Release of faeces |
Answer:
| Column-I | Column-II |
| Salivary gland | Saliva secretion |
| Stomach | Acid release |
| Liver | Bile juice secretion |
| Rectum | Storage of undigested food |
| Small intestine | Digestion is completed |
| Large intestine | Absorption of water |
Draw a labelled diagram of human digestive system
Answer:
Can we survive only on raw, leafy vegetables/grass? Discuss.
Answer:
No, we cannot survive only on raw, leafy vegetables/ grass. Because they mainly consist of Cellulose which is very difficult to digest by us due to deficiency of cellulose digesting enzymes in our digestive system. Moreover, our body needs different kinds of nutrients for growth, maintenance and proper functioning.
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