What happens during fertilisation in humans after many sperms reach close to the ovum?
Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
All sperms excepts the one nearest to the ovum lose their tails
Cells of corona radiata trap all the sperms excepts one
Cells of corona radiata trap all the sperms excepts one
A.
Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
The process of fusion of a sperm with an ovum is called fertilisation. During fertilization, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that blocks the entry of additional sperms. Thus, it ensures that only one sperm can fertilise an ovum. The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane.
The technique called gamete intra-fallopian transfer (GIFT) is recommended for those females
who cannot produce an ovum
who cannot retain the foetus inside uterus
who cervical canal is too narrow to allow passage for the sperms
who cervical canal is too narrow to allow passage for the sperms
At which stage of HIV infection does one usually shows symptoms of AIDS?
When viral DNA is produced by reverse transcriptase
When HIV replicates rapidly in helper T- lymphocytes and damages large number of these
With 15 days of sexual contact with an infected person
With 15 days of sexual contact with an infected person
Which one of the following is the most widely accepted method of contraception in India, as at present?
Tubectomy
Diaphragms
IUDs (Intra Uterine Devices)
IUDs (Intra Uterine Devices)
About which day in a normal human menstrual cycle does rapid secretion of LH (popularly called LH surge) normally occurs?
14th day
20th day
5th day
5th day
