Class 7 Science Chapter 2 Nutrition in Animals

Last updated on October 8th, 2023 at 12:44 am

Class 7 Science Chapter 2 Nutrition in Animals

 

NCERT Class 7 Science Chapter 2 Nutrition in Animals Question-answer

 

Exercises

Fill in the blanks:

1. The main steps of nutrition in humans are __________, __________,__________, _________ and __________.
2. The largest gland in the human body is __________.
3. The stomach releases hydrochloric acid and ___________ juices which act on food.
4. The inner wall of the small intestine has many finger-like outgrowths called _________.
5. Amoeba digests its food in the ____________ .

Answers:-

1. Ingestion, digestion, absorption, assimilation and egestion.
2. Liver
3. Digestive
4. Villi
5. food vacuole.

 

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

1. Digestion of starch starts in the stomach. (T/F)
2. The tongue helps in mixing food with saliva. (T/F)
3. The gall bladder temporarily stores bile. (T/F)
4. The ruminants bring back swallowed grass into their mouth and chew it for some time. (T/F)

Answer:-

1. False 
2. True 
3. True
4. True

 

Tick (ü) mark the correct answer in each of the following:

 

(a) Fat is completely digested in the

• stomach
• mouth
• small intestine
• large intestine

Answer – small intestine

 

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

• stomach
• foodpipe
• small intestine
• large intestine

Answer – large intestine

 

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

Column I                                                      Column II

1. Food components	a. Product(s) of digestion
2. Carbohydrates	b.  Fatty acids and glycerol
3. Proteins	c.  Sugar
4. Fats	d. Amino acids

 Answers

1- a, 2.  – c, 3. – d, 4. – b

 

Q. – What are villi? What is their location and function?

Ans – Thousands of finger-like outgrowths cover the inner walls of the small intestine. These are referred to as villi. Its function is to increase the surface area available for digested food absorption.

 

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

Ans – The liver produces bile. The gall bladder stores bile juice. Bile juice is helpful in the digestion of fats.

 

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

Ans – Cellulose is a carbohydrate that ruminants can digest. The grass contains a lot of cellulose, which is a type of carbohydrate. Bacteria in the rumen of ruminants such as cattle and deer helps in the digestion of cellulose. Many animals, including humans, are incapable of digesting cellulose.

 

Q. – Why do we get instant energy from glucose?

Ans – Glucose is a simple sugar. It easily degrades in the cell with the help of oxygen and provides instant energy to the organism. Glucose is not digested; it is absorbed directly into the blood.

 

Q. – Which part of the digestive canal is involved in:

1. absorption of food ________________.
2. chewing of food ________________.
3. killing of bacteria ________________.
4. complete digestion of food ________________.
5. formation of faeces ________________.

Answers :-

1. Small intestine
2. Mouth
3. Stomach
4. Small intestine
5. Large intestine

 

Match the items of 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

Answers

1. Saliva secretion
2. Acid release
3. Bile juice secretion
4. Storage of undigested food, Release of faeces
5. Digestion is completed
6. Absorption of water

 

Class 7 Nutrition in Animals Extra Questions and Answers

 

Define Digestion?

Digestion refers to the process of breaking down complex food components into simpler substances.

 

Define Alimentary Canal?

The canal is divided into six compartments: (1) the buccal cavity, (2) the food pipe or esophagus, (3) the stomach, (4) the small intestine, (5) the large intestine ending in the rectum, and (6) the anus. The alimentary canal is made up of these components (digestive tract).

 

What is ingestion?

Food is taken into the body through the mouth. The process of taking food into the body is called ingestion

 

Define the Large intestine and its functions?