class seven science NCERT sol Nutrition in animals
Chapter 2: Nutrition in animals NCERT Solution
1. Fill in the blanks:
a. The main steps of digestion in humans are,———–, ———, ——– and——-
b. The largest gland in the human body is———
c. The stomach releases hydrochloric acid and———–juice which acts on the food.
d. The inner wall of the small intestine has many finger-like outgrowths called————-
e. Amoeba digests its food in the———–.
Answer
a. ingestion, digestion, absorption, assimilation
and egestion
b. liver
c. gastric
d. villi
e. food vacuole
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 food into their mouth and chew it for some time. (T/F).
Answer:
- F b. T c. T d. T
3. Tick (ü) mark the correct answer in each of the following:
Answer:
- small intestine. b. large intestine.
4. Match the items of Column I with those given in Column II.
Answer
Carbohydrates—sugar
Proteins—amino acids
Fats—fatty acids and glycerol
5. What are villi? What are their location and function?
Answer Small finger-like projections from the walls of the small intestine are called villi. It has got a network of blood vessels. Villi increase the surface area of the small intestine for absorption of digested food into the blood.
6. Where is the bile produced? Which component of the food does it digest?
Answer Liver produces digestive juice called bile. This juice is stored in a sac called gall bladder and helps in the digestion of fats in our body.
7. Which is that type of carbohydrate that is not digested by humans but digested by ruminants? Explain why it is so.
Answer Cellulose the carbohydrate that is not digested by humans but digested by ruminants. Ruminants have a large sac-like structure called rumen which is present in between the small intestine and large intestine. The cellulose is digested here by the action of certain bacteria which are not present in humans.
8. Why do we get instant energy from glucose?
Answer Glucose is the simplest form of carbohydrate which can be broken down easily to give energy. So, glucose is called instant energizer.
9. Which part of the digestive canal is involved in:
a. Absorption of food———-.
b. Chewing of food———-.
c. The killing of bacteria ————–.
d. Complete digestion of food ———–.
e. Formation of faeces————-.
Answer
a. Small intestine
b. Buccal cavity
c. Stomach
d. Small intestine
e. Large intestine.