Which cells or glands in an earthworm provide nutrition to the unfertilized eggs?

Chloragogen cells are responsible for:

Typhlosole found in $Pheretima$ occurs in

If an earthworm releases the cocoon from the posterior end instead of the anterior end,then:

Study the following in $Pheretima$.
$I.$ Dorso-intestinal blood vessels
$II.$ External intestinal plexus
$III.$ Internal intestinal plexus
$IV.$ Ventro-intestinal blood vessel
Arrange the blood vessels in the correct sequence of blood flow from the ventral blood vessel to the dorsal blood vessel.
The correct sequence is:

The calciferous glands present in the stomach of an earthworm secrete: