Short Question Answers - Nutrition in Animals Class 7 Notes | EduRev

Science Class 7

Created by: Praveen Kumar

Class 7 : Short Question Answers - Nutrition in Animals Class 7 Notes | EduRev

The document Short Question Answers - Nutrition in Animals Class 7 Notes | EduRev is a part of the Class 7 Course Science Class 7.
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Ques 1: Fill in the blanks:

  1. The main steps of digestion 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 ____________.

Ans:

  1. buccal cavity, esophagus, stomach, small intestine and large intestine

Short Question Answers - Nutrition in Animals Class 7 Notes | EduRevFig: Buccal cavity2. liver

3. digestive juices

4. villi

5. food vacuole

 Ques 2: Mark ‘T’ if the statement is true and ‘F’ if it is false:

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

Ans:

  1. F
  2. T
  3. T

Short Question Answers - Nutrition in Animals Class 7 Notes | EduRevFig: Liver with gallbladderQues 3: Choose the correct option::

  1. Fat is completely digested in the (i) stomach  (ii) mouth  (iii) small intestine  (iv) large intestine
  2. Water from the undigested food is absorbed in the (i) stomach  (ii) food pipe  (iii) small intestine (iv) large intestine

Ans:

  1. (iii)
  2. (iv) 

Ques 4: Match the items in column I with those in column II:

Column I
Column II

Food components

Carbohydrates

Proteins

Fats

a) Products of digestion

b) Fatty acids and glycerol

c) Sugar

d) Amino acids

Ans:

Carbohydrates ---- Sugar.

Proteins --- Amino acids.

Fats --- Fatty acids and glycerol.

 Food components--- Products of digestion

Ques 5: What are villi? What are their location and function?

Ans: The inner wall of the small intestine has thousands of finger-like outgrowths called villi.
These are found in small intestine. The villi increase the surface area for absorption of food.
 Ques 6: Where is the bile produced? Which component of the food does it digest?

Ans: Bile is produced in the liver and is stored in a sac called the gall bladder. The bile plays an important role in the digestion of fats.

Short Question Answers - Nutrition in Animals Class 7 Notes | EduRevFig: Liver

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

Ans: Cellulose is the carbohydrate that can be digested by ruminants. Ruminants have large sac like structure between the small intestine and large intestine. The cellulose of the food is digested by the action of certain bacteria which are not present in human beings.

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

Ans: Because glucose easily breakdown in the cell with the help of oxygen and give carbon dioxide, water and energy 

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

  1. absorption of food __________.
  2. chewing of food __________.
  3. killing of bacteria _________.
  4. killing of bacteria _________.
  5. formation of faeces ____________.

Ans:

  1. small intestine
  2. mouth
  3. stomach
  4. small intestine
  5. large intestine

Short Question Answers - Nutrition in Animals Class 7 Notes | EduRevFig: Large intestine

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

Ans: Similarity: During the digestion of food, in amoeba digestive juices are secreted into the food vacuole. They act on the food and break it into simpler substances. In human being, the inner walls of stomach and the small intestine also secrete the digestive juices. The digestive juices convert complex substances of food to simpler ones. 

Difference: Amoeba feeds on some microscopic organisms. When it senses food, it pushes out pseudopodia around the food particles. The food is trapped in a food vacuole. Human beings take food through the mouth, digest and utilize it. The food is gradually digested as food travels through the various compartments.


 Ques 11: Match the items of column I with suitable items of column II:

Column I
Column II

salivary gland

stomach

liver

rectum

small intestine

large intestine

a)bile juice secretion

b)storage of undigested food

c)saliva secretion

d)acid release

e)digestion is completed

f)absorption of water

Ans:

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.

Short Question Answers - Nutrition in Animals Class 7 Notes | EduRevFig: Small intestine

 Ques 12: Can we survive only on raw, leafy vegetables/grass? Discuss.

Ans: We know that including all animals, fungi, many bacteria, non-green plants, and human beings do not possess the ability to synthesize their own food. Therefore depend on autotrophs for their food supply either directly or indirectly.
The green plants (leafy vegetables/grass) trap solar energy and manufacture their food in the form of glucose. So, leafy vegetables and grass can provide sufficient energy required for the survival of human beings.

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