In Earthworm,neurons are

Fertilization in earthworm is

The calciferous glands present in the stomach of an earthworm secrete:

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 $P, Q,$ and $R$ in the reproductive system of the earthworm shown in the figure.

Pharyngeal and septal nephridia open into the alimentary canal and are of the enteronephric type. This is an adaptation for: