In $Pheretima$,there are red-coloured round bodies in the $4th$,$5th$,and $6th$ segments above the alimentary canal. They are believed to be involved in:

Mark the correct statement regarding earthworm.

In earthworms,the pharyngeal nephridia are located in which segments?

Identify the incorrect statements among the following:
$(a)$ In earthworm,a single male genital pore is present.
$(b)$ Setae help in locomotion of earthworm.
$(c)$ The muscular layer in the body wall of earthworm is made up of only circular muscles.
$(d)$ Typhlosole is a part of the intestine of earthworm.

Identify $X$ and $Y$ from the given figure of the reproductive system of an earthworm:

Match the following columns regarding the types of nephridia in earthworms:

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