NCERT Class VII Science Solutions: Chapter 2-Nutrition in Animals Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 18:

Following statements describe the five steps in animal nutrition. Read each statement and give one word for each statement. Write the terms that describes each process.

  1. Transportation of absorbed food to different parts of body and their utilisation.
  2. Breaking of complex food substances into simpler and soluble substances.
  3. Removal of undigested and unabsorbed solid residues of food from the body.
  4. Taking food into the body.
  5. Transport of digested and soluble food from the Intestine to blood vessels.

Answer:

  1. Assimilation
  2. Digestion
  3. Egestion
  4. Ingestion
  5. Absorption

SHORT ANSWER QUESTIONS

Question 19:

Match the animals in Column I with their mode of feeding listed in Column II

Match the Column I and Column II (Q)
Column IColumn II
AnimalsMode of feeding
  1. House fly
  • Biting and chewing
  • Cockroach
  • Suckling
  • Mosquito
  • Sponging
  • Infants
  • Sucking

Answer:

Match the Column I and Column II (A)
Column IColumn II
AnimalsMode of feeding
  1. House fly
iii Sponging
  1. Cockroach
i Biting and chewing
  1. Mosquito
iv Sucking
  1. Infants
ii Suckling
Image Result for Mode of Feeding in Animals

Question 20:

Boojho took some grains of boiled rice in test tube A and Paheli took boiled and chewed rice in test tube ‘B’ . Both of them poured 1 - 2 drops of iodine solution into the test tube and observed the colour change. What colour change would they have observed? Give reasons for your answer.

Answer:

In test tube A - blue black colour because of presence of starch. In test tube ‘B’ - colour of iodine will not change because of digestion of starch into sugars.

Question 21:

A got her gall bladder removed surgically as she was diagnosed with stones in her gall bladder. After the surgery, she faced problems in digestion of certain food items when consumed in bulk. Can you tell which kind of food items would they be and why?

Answer:

The food item would be fat because bile juice of the gall bladder helps in the digestion of fat. Removal of gall bladder leads to difficulty in digestion of fatty substances.

Question 22:

Match the organs in Column I with the words listed in Column II.

Match the Column I and Column II (Q)
Column IColumn II
  1. Rectum
  • Mucous
  • Gall bladder
  • Villi
  • Stomach
  • Taste buds
  • Tongue
  • Faces
  • Small intestine
  • Bile juice

Answer:

Match the Column I and Column II (A)
Column IColumn II
  1. Rectum
iv Faces
  1. Gall bladder
v Bile juice
  1. Stomach
i Mucous
  1. Tongue
iii Taste buds
  1. Small intestine
ii Villi