A characteristic feature of the earthworm,Phe | vedclass

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Question

(A) The correct answer is $A$. In $Pheretima$ (earthworm),the intestine contains a longitudinal fold called the typhlosole. This structure projects in

Vedclass · Accepted Answer

The typhlosole greatly increases the effective absorptive area in the intestine.

Vedclass · Answer

(A) The correct answer is $A$. In $Pheretima$ (earthworm),the intestine contains a longitudinal fold called the typhlosole. This structure projects into the lumen of the intestine,significantly increasing the surface area for the absorption of digested food. Option $B$ is incorrect because while setae are $S$-shaped and embedded in the integument,they are primarily used for locomotion,not as defensive weapons. Option $C$ is incorrect because earthworms possess lateral hearts,not a single long dorsal tubular heart. Option $D$ is incorrect because fertilization in $Pheretima$ is external,occurring within cocoons deposited outside the body.

$A$ characteristic feature of the earthworm,$Pheretima$,is that:

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