Final answer:
The seminal receptacle is a storage organ in the reproductive system of earthworms that stores and preserves sperm received from the mating partner for later use in fertilizing eggs.
Step-by-step explanation:
An essential component of the earthworm reproductive system is the seminal receptacle, which is where fertilisation takes place. It serves as a repository for sperm obtained from the mate, which is subsequently utilised to fertilise eggs.
When the eggs are ready for fertilisation, the seminal receptacle makes sure the sperm is kept safe and accessible.
Earthworms exchange sperm with one another during mating. The earthworm's seminal receptacle receives the sperm from the other worm.
The stored sperm and the earthworm's own eggs are released into the cocoon when the cocoon is secreted later. This permits internal fertilisation to take place inside the cocoon's protected environment.
Your question is incomplete, most probably the complete question is:
"In the class Oligochaeta, specifically within the reproductive system of earthworms, what is the function and significance of the seminal receptacle?"