Question

Why hydraulic acid is used to remove egg cell

Answer 1

I think u mean hyaluronic acid

This acid is present in the acrosome which is present at the top of the head of the sperm cell

This acid helps to penetrate into the egg cell by dissolving the egg membrane

The presence of this acid is necessary to complete the process of fertilization thus leading to formation of zygote

I hope this helps (θ‿θ)