Through which of the following does an earthworm respire?

In $Pheretima$,sperms are stored in the............

Give scientific reasons: Earthworm is known as the farmer's friend.

Which of the following animal's sensory system does not have eyes but does possess light and touch sensitive organs (receptor cells) to distinguish the light intensities and to feel the vibrations in the ground?

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

Which of the following statements is true regarding the earthworm?