Locomotion in earthworm is directly facilitat | vedclass

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(D) Locomotion in earthworms $(Pheretima)$ is achieved through the coordinated action of the body wall muscles and the $S$-shaped structures called $S

Vedclass · Accepted Answer

Setae and contraction of segments

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(D) Locomotion in earthworms $(Pheretima)$ is achieved through the coordinated action of the body wall muscles and the $S$-shaped structures called $Setae$.$1$. The body wall contains both circular and longitudinal muscles.$2$. Contraction and relaxation of these muscles result in the lengthening and shortening of the body segments.$3$. $Setae$ are embedded in the epidermal pits of each segment (except the first,last,and clitellum) and act as anchors to provide grip against the substrate.$4$. Therefore,the combination of muscular contraction and the gripping action of $Setae$ facilitates movement.

Column-$I$	Column-$II$
$P$. Septal nephridia	$I$. $15^{th}$ segment to the last segment
$Q$. Integumentary nephridia	$II$. $4^{th}, 5^{th}$ and $6^{th}$ segments
$R$. Pharyngeal nephridia	$III$. $3^{rd}$ segment to the last segment

Locomotion in earthworm is directly facilitated by

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