Updated By SaraNextGen

On March 11, 2024, 11:35 AM

Question 4:

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

Question 5:Answer:

What are villi? What is their location and function?

Answer:

Villi are tiny finger-like projections originating from the walls of the small intestine. They increase the surface area for absorption of the digested food. The blood vessels present inside the villi can absorb the nutrients from the digested food.

Structure of a villus

Question 6:

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

Answer:

Liversecretes the bile juice which is stored in the gall bladder. Bile plays an important role in the digestion of fats.

Question 7:

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

Answer:

Cellulose is a type of carbohydrate that can be digested by ruminants and not by humans. Ruminants have a large sac-like structure between small and large intestine where the food containing cellulose is digested by the action of certain bacteria. On the other hand, humans cannot digest cellulose, as the cellulose digesting enzymes are absent in them.

Question 8:

Why do we get instant energy from glucose?

Answer:

Glucose is a simple sugar. Carbohydrates, when consumed, have to be digested into glucose. As glucose can be easily absorbed in blood, it provides energy to the body. Hence, when glucose is directly taken, it does not have to be digested and thus acts as an instant source of energy.

Question 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 of food ____.

(v) formation of faeces ____.

Answer:

(i) absorption of food __small intestine__

(ii) chewing of food __buccal cavity__

(iii) killing of bacteria __stomach__

(iv) complete digestion of food __small intestine__

(v) formation of faeces __large intestine__

Question 10:

Write one similarity and one difference between the nutrition in Amoeba and human beings.

Answer:

Similarity between nutrition in Amoeba and human beings:

Both Amoeba and humans require energy for the growth and maintenance of their bodies. This energy is derived from the food that they eat. The food that they consume is always in a complex form and is therefore broken down into simpler forms by the process of digestion. Hence, both these organisms are heterotrophs.

Differences between nutrition in Amoeba and human beings:

Match the items of Column I with suitable items in Column IIQuestion 11:

Answer: