Digestion and Absorption: CBSE Class 11 NCERT Solution

Find the CBSE Class 11 Biology NCERT Solution for the Chapter- 16, Digestion and Absorption. It has been framed keeping the Students' perspective in mind. This will help the Students with easy and simple understanding of the concept and technique employed in solving as per the CBSE Marking Scheme.

Few Sample Question from this Chapter are given below:

Q. Choose the correct answer among the following:

(a) Gastric juice contains

(i) Pepsin, lipase and rennin

(ii) Trypsin lipase and rennin

(iii) Trypsin, pepsin and lipase

(iv) Trypsin, pepsin and renin

(b) Succus entericus is the name given to

(i) A junction between ileum and large intestine

(ii) Intestinal juice

(iii) Swelling in the gut

(iv) Appendix

Ans.

(a) Gastric juice contains: (i) Pepsin, lipase, and rennin

(b) Succus entericus is the name given: (ii) Intestinal juice

Q. Bile juice contains no digestive enzymes, yet it is important for digestion. Why?

Ans. Bile juice is secreted by the liver and acts as a digestive juice. It contains bile salts such as bilirubin and biliverdin which break down large fat globules into smaller globules so that the pancreatic enzymes can easily act on them. This process is known as emulsification of fats. Bile juice also activates lipases.

Q. Describe the digestive role of chymotrypsin. What two other digestive enzymes of the same category are secreted by its source gland?

Ans. Chymotrypsin is the active form of inactive enzyme chymotrypsinogen which is activated by the enzyme trypsin present in the pancreatic juice. Chymotrypsin helps in the further breakdown of the partially-hydrolysed protein, hence completes the digestion of protein. Other two digestive enzymes of the same category secreted by its source gland  are trypsin and carboxypeptidases.

Q. What would happen if HCl were not secreted in the stomach?

Ans. Hydrochloric acid is necessary to make the medium acidic which allows inactive enzyme pepsinogen to be converted into pepsin. Pepsin plays an important role in the digestion of proteins. Moreover, it also kills various microbes which may be present in food. These actions would not be possible in the absence of hydrochloric acid.