Correct option is A
During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of additional sperms
During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of additional sperms
Human placenta is derived from:
Hormones secreted by the placenta to maintain pregnancy are:
Oral contraceptive pills help in birth control by:
Which one of the following sexually transmitted diseases (STD) correctly matches with its pathogen?
Acrosome reaction is triggered by:
Is there a Visible difference between sperms which contain X chromosomes and sperms which contain Y chromosomes?
The nutrients are supplied to the foetus from the mother through:
Which of the following is NOT a part of the female reproductive system?
What happens during menstruation?