The approximate number of earthworms found in $1$ acre of land is..........

Match the regions of the earthworm based on the clitellum:
$P$ - Segments $14$ to $16$
$Q$ - Segment $17$ to the last segment
$R$ - Segments $1$ to $13$
Identify the correct sequence for the Pre-clitellar region,Post-clitellar region,and Clitellar region,respectively.

The parasite found in the seminal vesicle of earthworm is:

The famous Indian scientist who described Pheretima posthuma is ...........

The septal nephridia of an earthworm discharge their excretory products into the.........

Which of the following are the excretory organs of an earthworm?