Answer briefly:
(a) Why are villi present in the intestine and not in the stomach?
(b) How does pepsinogen change into its active form?
(c) What are the basic layers of the wall of alimentary canal?
(d) How does bile help in the digestion of fats?

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Solution

(a) The mucosal wall of the small intestine forms millions of tiny finger-like projections known as villi. These villi increase the surface area for more absorption of nutrients.
(b) The gastric gland secretes gastric juice which contains pepsinogen, HCl, and mucus. HCl mixed with food and make it acidic when pepsinogen comes in contact with acidic food it gets activated and converts into the pepsin an active enzyme.
(c) The wall of the alimentary canal is made up of four layers serosa, muscularis, submucosa and mucosa.
(d) Bile is secreted by the liver it emulsifies the fats and activates the lipase enzyme for further digestion of fat.

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3. Answer briefly:

a) Why are villi present in the intestine and not in the stomach?

b) How does pepsinogen change into its active form?

c) What are the basic layers of the wall of the alimentary canal?

d) How does bile help in the digestion of fats?

How does bile help in the digestion of fats?

Q. Read the following passage carefully and answer the questions that follow it. Bile juice is stored in a sac called, gallbladder, located near its organ of secretion, the liver. The gallbladder releases the bile juice into the small intestine whenever food reaches there. Though bile juice is devoid of any digestive enzymes, it is required for the digestion of fats. The fats cannot be digested easily because they are insoluble in water and are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then easily digested by the enzymes released from the pancreas.

(a) Which organ secretes the bile juice?
(b) Why is digestion of fats difficult as compared to that of other nutrients?
(c) How does bile juice help in the digestion of fat?
(d) Where is the digestion of fat completed?
(e) Does bile juice digest fat completely?

Question 27
Read the following passage carefully and answer the questions that follows it.

Bile juice is stored in a sac called the gall bladder, located near its organ of secretion that is the liver. The gall bladder releases the bile juice into the small intestine whenever food reaches there. Though bile juice is devoid of any digestive enzymes, it is required for the digestion of fats. The fats cannot be digested easily because they are insoluble in water and are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then easily digested by the enzymes released by the pancreas.

(a) Which organ secretes the bile juice?

(b) Why is digestion of fats difficult as compared to that of other nutrients?

(d) Where is the digestion of fat completed?

(e) Does bile juice digest fat completely?

Q. How does bile helps in digestion of fats and other nutrients of food?

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Answer briefly:(a) Why are villi present in the intestine and not in the stomach?(b) How does pepsinogen change into its active form?(c) What are the basic layers of the wall of alimentary canal?(d) How does bile help in the digestion of fats?

Answer briefly:
(a) Why are villi present in the intestine and not in the stomach?
(b) How does pepsinogen change into its active form?
(c) What are the basic layers of the wall of alimentary canal?
(d) How does bile help in the digestion of fats?