What do the spermathecae of Pheretima represent?

Photoreceptors of earthworm occur on

In earthworms,smaller blood vessels deliver blood to the .....

Which of the following types of nephridia is not found in earthworms?

Which structure in the earthworm is capable of secreting hormones?

$A$ transverse section of $Pheretima$ taken through the $10^{th}$ segment is observed under a microscope. Which of the following structures can be observed in the section?