Question

Fertilizin is a chemical substance produced from?
A. Mature eggs (ovum)
B. Acrosome
C. Polar bodies
D. The middle piece of sperm

Answer 1

Hint:
A chemical secretion of the upper most layer of egg is known as fertilizin. It is mucopolysaccharide also called glycoprotein which attracts the sperms for the process of fertilization. Fertilizin combines with the sperm antifertilizin of the same species. Minimization of the number of spermatozoa around the egg is the main function of the fertilizin antifertilizin complex. So that the chances of the polyspermy i.e. two or more spermatozoa that fuse with the egg at the same time can be diminished.

Complete answer:
> Option (A) mature eggs (ovum)
The egg cell, or ovum (plural form ova), is a female reproductive cell, also called gamete, in most of the anisogamous organisms, the organisms that reproduce sexually with a larger, "female" gamete and a smaller, "male" one. When the female gamete is not capable of movement (non-motile) this term is used.
> Option (B) is acrosome
 An organelle that develops over the anterior half of the head in the spermatozoa (sperm cells) of many animals including the humans is known as acrosome. It is derived from the Golgi apparatus and is a cap-like structure. The acrosome contains the digestive enzymes (including hyaluronidase and acrosin) in Eutherian mammals.
> Option (C) is polar bodies
A small haploid cell that is formed concomitantly as an egg cell during the process of oogenesis, but generally does not have the ability to be fertilized is known as a polar body. When some of the diploid cells in animals undergo the process of cytokinesis after meiosis for the production of egg cells, they divide unevenly sometimes.
> Option (D) is Middle piece of sperm
A small middle portion of the sperm contains the mitochondria. Sometimes the tail of the sperm is called the flagellum and is a slender, hairlike bundle of filaments which connects to the head and middle portion.

Note:
Fertilizin is a protein. Its most specific interaction with a substance surrounding the sperm cells, known as antifertilizin, causes the sperm to adhere to and to penetrate the egg. This process is thought to ensure the process of fertilization of the ovum specifically by the sperm of its own species.