Question

In earthworm, the anterior loops are situated in

• A. $4^{th}$ and $5^{th}$ segment
• B. $6^{th}$ and $8^{th}$ segment
• C. ${10}^{th}$ and ${11}^{th}$ segment
• D. ${12}^{th}$ and ${13}^{th}$ segment.

Answer 1

Answer: (C)

${10}^{th}$ and ${11}^{th}$ segment

Anterior loops are two pairs of loops like vessels, one pair in 10th and 11th segments. They connect the lateral-oesophageal blood vessels with the supra-oesophageal blood vessel. Anterior loops are non-muscular, non-valvular and non-pulsatile.

So, the correct option is '10th and 11th segment'.