Question

1. Give reasons for the following.
1 When we chew a chappati for some time it tastes sweet.
2. The small intestine has a large number of villi.​

Answer 1

Explanation:

1)Our saliva contains the enzyme called " amylase". When we chew food, amylase acts on starch and converts into SUGARS which tastes sweet. The piece of chapati tastes sweet as the saliva secreted by our salivary glands breaks down the starch into simple sugars which makes it taste sweet.

2)The villi of the small intestine project into the intestinal cavity, greatly increasing the surface area for food absorption and adding digestive secretions. The villi number about 10 to 40 per square millimetre (6,000 to 25,000 per square inch) of tissue.