In Earthworm,the mouth is situated on

If a transverse section of $Pheretima$ is cut through the $20^{th}$ segment,it contains:

The copulation period of an Earthworm is:

What is the function of the female genital pore in an earthworm?

Identify the correct terms for the following analogy:
$(i)$ Excretory organ in cockroach : Malpighian tubules :: In earthworm : ...........
(ii) Scientific name of cockroach : Periplaneta americana :: Scientific name of earthworm : ...........

The famous Indian zoologist who wrote a memoir upon $Pheretima$ $posthuma$ is: