If a live earthworm is pricked with a needle on its outer surface without damaging its gut,the fluid that comes out is

In which segments of the earthworm are the septa absent?

Earthworms are known as the 'friends of farmers' because:

Mention the function of the following:
Body wall in earthworm

In earthworm,fertilization occurs in

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.