A person with unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid cetificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?

1. Type AB

2. Type O

3. Type A

4. Type B

'Bundle of His' is a part of which one of the following organs in humans?

1. Heart

2. Kidney

3. Pancreas

4. Brain

All veins carry deoxygenated blood except

1. pulmonary vein             

2. hepatic vein

3. hepatic portal vein         

4. renal vein

Thickening of arteries due to cholesterol deposition is:

1. atherosclerosis             

2. rheumatic heart

3. blood pressure               

4. cardiac arrest

The opening between the right atrium and the right ventricle is guarded by the valve named

1. bicuspid valve                   

2. tricuspid valve

3. mitral valve                       

4. semilunar valve

Identify the given figure and select the correct option 

1. Neutrophil - phagocytic cell which destroy foreign organisms entering the body

2. Eosinophil - their number increases during allergic infection

3. Lymphocyte - small sized non-motile and non-phagocytic

4. Monocyte - motile and phagocytic in nature

The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the labels along with their functions and select the correct option.

1. C - Vena Cava - takes blood from body parts to right atrium, P_CO2 = 45 mm Hg

2. D - Dorsal aorta - takes blood from heart to body parts, P_O2 = 95 mm Hg

3. A - Pulmonary vein - takes impure blood from body parts to heart, P_O2 = 60 mm Hg

4. B - Pulmonary artery - takes blood from heart to lungs, P_O2 = 90 mm Hg.

Haemoglobin is

1. an oxygen carrier in human blood

2. a protein used as food supplement

3. an oxygen scavenger in root nodules

4. a plant protein with high lysine content

Which of the following matches correctly?

Serum is-

1. Blood $minus$ corpuscles

2. (Blood $minus$ corpuscles) $minus$ clotting factors

3. Plasma minus clotting factors

4. Both (2) and (3)