Question

In earthworm, the characteristic internal median fold of dorsal wall of the intestine, called as 'typhlosole' is present in

• A. 5${}^{th}$ to 9${}^{th}$segments
• B. 9${}^{th}$ to 14${}^{th}$ segments
• C. 26${}^{th}$ to 25${}^{th}$ segments
• D. 15${}^{th}$ to last segment
• E. 35${}^{th}$ to last segment

Answer 1

Answer: (C)

26${}^{th}$ to 25${}^{th}$ segments

The lining of the intestine in earthworm is folded to form villi, one of these villi becomes larger than the others and is known as typhlosole. The typhlosole runs mid-dorsally from the ${26}^{th}$ segment to ${25}^{th}$ segments.

So, the correct answer is '${26}^{th}$ segment to ${25}^{th}$ segments'