Solution of Chapter 16. Digestion and Absorption (Biology NCERT Book)

1 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? 

2 State the role of pancreatic juice in digestion of proteins.

3 Describe the process of digestion of protein in the stomach.

4 Give the dental formula of human beings.

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

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

7 How are polysaccharides and disaccharides digested?

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

9 How does butter in your food get digested and absorbed in the body?

10 Discuss the main steps in the digestion of proteins as the food passes through different parts of the alimentary canal.

11 Explain the term thecodont and diphyodont.

12 Name different types of teeth and their number in an adult human.

13 What are the functions of the liver?