Ovum Structure

Q.

Mature ovum in human being is surrounded by

1. Graafian follicle

2. Corona radiata

3. Zona pellucida

4. Zona interna

Q. The number of chromosomes present in the gametes of a housefly is six. How many chromosomes are present in the meiocytes of a housefly?

1. 24
2. 12
3. 46
4. 6

Q.

The main function of the multiple cortical granules released from the oocyte into the perivitelline space is -

1. Aid in the entry of 2 sperms into the ovum to form fraternal twins

2. Prevent binding of additional sperm

3. Activate special receptors to which sperm attaches

4. None of the above

Q.

Entry by other sperms into the oocyte is stopped after the first one penetrates the

1. Granulosa cells

2. Corona radiata

3. Zona pellucida

4. Cytoplasm