Fertilization in Humans

Given below are four statements pertaining to fertilization in human beings. Identify the correct statement.

I. Fertilisation can occur if the ovum and the sperms are transported simultaneously to the ampullary region of the Fallopian tube.

II. The secretion of the acrosomes helps the sperm enter the cytoplasm of the ovum.

III. The completion of the meiotic division of the secondary oocyte is induced by the entry of sperms into it.

IV. Hyaluronidase secreted by the acrosomes ensures that only one sperm can fertilise the ovum.

The metabolic activity (s) that takes place after the entry of sperms into the ovum are/is

Given below is a structure of an ovum surrounded by few sperms. Choose the correct option w.r.t. the identification of the labelled structures $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ and the enzymes used to dissolve these structures.

Match the following with correct combination.

Capacitation occurs in:

Identify the INCORRECT match.

Which of the following statement about fraternal twins is INCORRECT?

Fertilization results into

Which enzyme is involved in penetration of sperm into ovum?

The diploid number of chromosomes is restored by the process of

On fusion of egg nucleus with sperm nucleus

Survival time of sperms introduced into the vagina may be

Acrosome facilitates the sperm to

The acrosome lysin of the sperm that helps it to penetrate the zona pellucide is/are?

Which one is correct with regards to fertilization?

During the process of fertilization, the sequence of layers crossed by sperm are:

Which of the following events makes zona pellucida thick and blocks its receptors for sperm binding and checks polyspermy?

Sperm of animal species X cannot fertilize ovum of species Y because:

What happens during fertilization in human after many sperms reach close to the ovum?

The minimum number of meiotic divisions required to form fraternal twins are