Question

Assertion- The cells lining the villi help in absorption.
Reason- The cells lining villi have numerous microscopic projections which increase the surface area enormously.

• A. Both assertion and reason are true and the reason is the correct explanation of the assertion
• B. Both assertion and reason are true but the reason is not the correct explanation of the assertion
• C. The assertion is true but the reason is false
• D. Both assertion and reason are false

Answer 1

The correct option is A Both assertion and reason are true and the reason is the correct explanation of the assertion

The cells lining the villi produce numerous microscopic projections called microvilli giving a brush border appearance. These modifications increase the surface area enormously. Villi are supplied with a network of capillaries and a large lymph vessel. Different enzymes help break down complex molecules into simple molecules. Then these simple molecules are absorbed by the intestine with the help of finger-like projections called villi. These villi provide high surface area for the absorption and also contain blood vessels. These molecules are absorbed by blood vessels and move throughout the body to perform various functions like cell repair, cell regeneration, etc.