The onset of menstruation in women is called ;

1. Parturition
2. Menopause
3. Ovulation
4. Menarche

In the human menstrual cycle, the ovulation occurs around :

1. 7 days
2. 21 days
3. 28 days
4. 14 days

The packing tissues between the coils of the seminiferous tubules are called as :

1. Leydig cells
2. Hymen
3. Graafian follicle
4. Clitoris

Which of the following cannot pass readily through the placenta to the foetus ?

1. Antibodies
2. Amino acids
3. Alcohol
4. Haemoglobin