Question

Assertion: The inner lining of small intestine has numerous finger like projections called villi.
Reason: The villi increases the surface area for digestion.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true.

Answer 1

The correct option is A

Explanation of the assertion statement:

1. The small intestine is the longest part of the alimentary canal.
2. It is a highly coiled structure of about 7.5 meters in length.
3. It is a very narrow tube with a large internal surface area.
4. It is the site of complete digestion in humans.
5. It absorbs digested food completely.
6. For the absorption the inner lining of the intestine has small finger like projections called villi.

Explanation of the reason statement:

1. They are small finger-like foldings in the small intestine.
2. A network of capillaries and a big lymph vessel called the lacteal supply the villi.
3. Villi enhance the absorption surface area.
   

4. This helps in fast absorption of the digested food.

Final answer: Both A and R are true and R is the correct explanation of A.