Question

what is the role of primary egg envelopes in fertilisation?

Answer 1

primary egg is the starting of fertilisation.

Answer 2

The role of primary egg envelopes in fertilization is that It provides sperm receptors that are generally species specific and helps prevent polyspermy; it protects the developing embryo yet yields at the time of hatching.

In most vertebrate eggs (including some mammals), a jelly or albumen coat is added to the vitelline envelope.