Assertion (A) : The foetus respires but does not breathe.

Reason (R): The maternal blood supplies oxygen to the foetus through placenta.

1. A is True and R is False
2. A is False and R is True
3. Both A and R are True
4. Both A and R are False

During ventricular systole, the atrioventricular valves (P) …………… and semilunar valves (Q) …………… .

1. P-close, Q-open
2. P-close, Q-close
3. P-open, Q-close
4. P-open, Q-open

The onset of menstruation in a human female is called:

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

Assertion (A): Rods and Cones are photoreceptors in the sclera of eyeball.

Reason (R): Rods are sensitive to dim light.

1. A is True and R is False.
2. A is False and R is True.
3. Both A and R are True.
4. Both A and R are False.