Assertion (A): The main pulmonary artery pumps oxygenated blood from the right ventricle into the lungs.

Reason (R): Inside the lungs, the artery divides and divides several times to form capillaries around the air sacs.

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.

Given below are some common reflexes in humans.

i. Quick closing of the eyelids when a strong beam of light is flashed across.

ii. Apply brakes to your vehicle if anything suddenly comes in front.

iii. Playing a musical instrument.

iv. Coughing reflex, when the food is swallowed, enters the windpipe.

The conditioned reflexes are:

1. i and ii
2. ii and iii
3. iii and iv
4. i and iv

The four major steps in seeing an object are:

i. interpretation by the brain.

ii. focussing of image.

iii. entry of light rays.

iv. transmission of nerve impulses from the retina & brain.

The correct sequence will be:

1. i, ii, iii, iv
2. ii, iii, iv, i
3. iii, ii, iv, i
4. iv, i, ii, iii

Based on the given figure, identify the structural as well as the functional unit of kidney:

1. A
2. B
3. C
4. D