Class 7 Science NCERT Chap 2

CHAPTER 2 

NUTRITION IN ANIMALS

Here is some important points and answer of chapter 2 NUTRITION IN ANIMALS NCERT science of class 7 which helps students to better understand topics of chapter 2 NUTRITION IN ANIMALS.

Keywords:-

a) Absorption:- Absorbing of digested food by the small intestine is known as Absorption.

b)Amoeba:- It is unicellular organism which can change its shape.

c) Assimilation:- Transfer of digestion food  and its utilisation is known as assimilation.

d)Egestion:- Removing out waste from body is known Egestion.

e)Bile:- A yellowish liquid release from liver.

f)Villi:-Finger like projection present in small intestine help in absorb digested food.

g)Digestion:- The break down of complex form of food into simple form is known as Digestion.

h) Ruminant:- The animals which chew cud are called Ruminants.

These are the important keynotes of Chapter 2 Nutrition in Animals.

Here is the Solution Of textbook CHAPTER 2 Nutrition In Animals.

Exercise Questions-

Ques 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 outgrowth called __________.

e)Amoeba digests its food in the _________.

Ans.a) ingestion,digestion, absorption, assimilation and egestion.

b)liver

c)gastric

d)villi

e)food vacoule

Ques 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)

Ans. a) False

b) True

c)True

d)True

Ques 3. 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. Small intestine

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

i)stomach

ii)foodpipe

iii)small intestine

iv) large intestine

Ans.iv) large intestine

Ques 4. Match the items of column I with those given in Column II.

Column I.                                       Column II

Food Components.     Product(s) of digestion

a) Carbohydrates.      i)Fatty acids and glycerol

b)Proteins.                   ii)Sugar

c)Fats.                            iii)Amino acids

Ans. a) Sugar

b)Amino acids

c)Fatty acids and glycerol

Ques 5. What are villi? What is their location and function?

Ans. Villi are finger like projection present in small intestine help in absorption of digested food and send to all parts of body.

Ques 6. Where is the bile produced? Which component of the food does it help to digest?

Ans. Bile is produced in liver and store in gall bladder. It help in the digestion of fats.

Ques 7. Name the type of carbohydrates that can be digested  by ruminants but not by humans. Give the reason also.

Ans. Cellulose is a type of carbohydrates which can not digest by humans because only ruminants are having a special structure called rumen with bacteria which help in the digestion  of cellulose.

Ques 8. Why do we get instant energy from glucose?

Ans. We get instant energy from glucose because it is a simpler type of carbohydrates which do not take time in break down.

 

Ques 9. Which part of the digestive canal is involved in:-

i) Absorption of food

ii) Chewing of food

iii)killing of bacteria 

iv) Complete digestion 

v)Formation of faeces

Ans. i) VILLI(small intestine)

ii) mouth 

iii)stomach 

iv) small intestine

v) large intestine

Ques 10. Write one similarity and one difference  the  nutrition in amoeba and human beings.

Ans. Similarity-

Both human and amoeba  used digestive juice  for digest it food.

Difference-

Human chew their food but amoeba does not chew their food.

Ques 11. Match the items of Column I with suitable items in Column II. 

Column I.                               Column II

a)Salivary gland.                 i)Bile juice 

b)Liver.                                ii) storage of undigested food

c) Liver.                               iii)Saliva secretion

d)Rectum.                           iv)Acid rain

e)Small intestine.               v) Digestion is completed.

f)large intestine.                vi) absorption of water.                                                                                                                               vii)Release of  faeces

Ans. a) saliva secretion

b) acid release

c)bile juice of secretion

d)storage of undigested food

e)digestion is completed

f) absorption of water 

Ques 12. Label fig. 2.11 of the digestive system.

Ans.

Ques 13. Can we survive only on raw,leafy vegetables/ grass?

Ans. No, we can not survive on leafy vegetables or grasses because our body required different Types of nutrition which all we don't get from it  and also our body is not able to digest cellulose which present in grass.

This is the complete solution and explaination of Chapter 2 NUTRITION IN ANIMALS of Class 7 Science NCERT.

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