Question

In earthworm, typhlosole occurs between

A. 20 - 90 Segments

B. 26 - 95 segments

C. 20 - 95 segments

D. 21 - 100 segments

Answer 1

Hint: Typhlosole is an internal fold of the intestine which is found in annelids, echinoderms, etc and this increases the intestine surface area for better absorption of nutrients.

Complete answer:

There is the presence of a dorsal flap of the intestine in earthworms and this flap runs along most of its length which then forms a tube within a tube which is called typhlosole. By forming a tube within a tube, it increases the absorption area by that of its inner surface which further helps for more effective absorption of digested nutrients.

The presence of an internal fold of the dorsal wall of intestine is the characteristic feature of the intestine and this typhlosole is present between the 26th and 95th segments which increases the area for effective absorption of digested nutrients.

As we can see option B which is 26 - 95 segments, is the correct one because this intestinal fold i.e., typhlosole occurs between the 26th and 95th segment which makes this option correct.

Thus, the correct answer is option (B)  which is 26 - 95 segments. 

Note:

There is the presence of an internal fold in the intestine which is referred to as typhlosole and this fold in earthworm helps to increase the surface area for absorption of digested nutrients this fold occurs between segments 26th and 95th.