Assertion. The wall of left ventricle is thicker than the wall of right ventricle.

Reason. The left ventricle must generate enough force to pump oxygenated blood to the entire body, so it has thicker muscular walls compared to the right ventricle, which pumps blood to the lungs.

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. The respiratory pigment haemoglobin (Hb) is formed of RBCs and albumin.

Reason. Haemoglobin contains an iron-containing part called haemin. It is richly found in erythrocytes.

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 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.