Assertion Thrombin is the inactive form of prothrombin which is produced during blood coagulation.

Reason Vitamin K, a fat-soluble vitamin, is essential for the production of prothrombin.

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

Assertion. Blood group 'AB' does not contain any antibody but contains both the antigens 'A' and 'B'.

Reason. In humans, WBCs have specific proteins on their surfaces. These proteins are called antibodies.

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

Assertion. Renal artery carries deoxygenated blood full of nitrogenous wastes.

Reason. Most of the arteries carry oxygenated blood, but there are exceptions.

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

Assertion. Efferent arteriole is wider than the afferent arteriole.

Reason. The difference in the size of the diameter of these arterioles creates a high pressure known as hydrostatic pressure. This pressure helps in the process of ultrafiltration through the glomerulus.

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