Question

In Earthworm, the cocoon is formed by
A. Epidermal muscles
B. Setae
C. Cuticle
D. Clitellum.

Answer 1

Hint: Earthworm is a terrestrial invertebrate where it belongs to Opisthopora, the plan of the body of the earthworm can be called as a tube within the tube body plan and these worms are segmented both internally and externally, and they have setae on all segments.

Complete answer:
The body of the earthworm is generally divided into segments called metamers and they are in the range of 100 to 120 in number.
The first segment of the body is called a buccal segment
In these worms, the mouth is covered by a structure called Prostomium.
An earthworm has a glandular tissue that presents around the segments of 14 to 17 is called the clitellum. And this structure clitellum generally has seen only when the worms are mature
These worms are hermaphroditic, so they can reproduce either sexually or Parthenogenetic.
In these worms, the female genital pores are present and they are situated ventrally on segment 18.
Genital papilla may also present on the ventral side.
In these genera, the development of the genus is without the larval stage where they usually develop in cocoons. And these cocoons are useful for the storage of eggs of the earthworms, where they produce viscous fluid.
They are nocturnal and they have aversion to light, so they come out only at night, so they feed and reproduce only at night.
Like all the earthworms, they keep the body moist because they exchange gases through skin.
So, the correct answer is “Option D”.

Note: Earthworms are generally called farmer’s friends as they help in making the soil porous and they generally use vermicomposting. In the Chinese countries some of the genera of the earthworms are administered for some medical conditions, and other biological things.