What terms is used for the chemical which occurs in the sperms' acrosome and helps in the sperm's entry into the egg?

Sperm acrosome is derived from

Acrosomal reaction of the sperm occurs due to:

List the chemical events which occur during muscle contraction.

What is meant by the term chemical formula?

What are the uses of chemical fertilizers ?

Give the technical terms used for the following: The chemicals which can be sprayed on the leaves to either bring about closure of stomata or to form aflim on their surface to check transpiration.

What is sperm?