Haemoglobin is

• An oxygen carrier in human blood

• A protein used as a food supplement

• An oxygen scavenger in root nodules

• A plant protein with high lysine content

Carbon monoxide is a pollutant because it

• Reacts with oxygen

• Inhibits glycolysis

• Reacts with haemoglobin

• Makes nervous system inactive

Calcitonin is a thyroid hormone which

• Elevates potassium level in the blood

• Lowers calcium level in a blood

• Elevates calcium level in the blood

• Has no effect on calcium

During urine formation, which of the following process create thigh osmotic pressure in the uriniferous tubule?

• Active Na⁺ absorption, followed by absorption of Cl⁻

• Active Cl⁻ absorption, followed by absorption of Na⁺

• Active secretion of Na⁺ into efferent arteriole followed by absorption of Cl⁻ into the efferent renal arteriole

• Active secretion of Cl⁻ and absorption of Na⁺ into the efferent renal arteriole

If due to some injury the chordate tendinae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect?

• The flow of blood into the aorta will be slowed down

• The ‘pace maker’ will stop working

• The blood will tend to flow back into the left atrium

• The flow of blood into the pulmonary artery will be reduced

 Blood is a kind of

• Areolar tissue

• Connective tissue

• Fluid connective tissue

• Reticular connective tissue

In cardiac cycle maximum time is taken by

• Atria systole

• Atria diastole

• Ventricle systole

• Ventricle diastole

Rh-factor can produce disease

• AIDS

• Tumer’s syndrome

• Erythroblastosis foetalis

• Sickle cell anaemia

The problem due to Rh factor arises when the blood of two (Rh and Rh) mixup

• During Pregnancy

• Through transfusion

• In a test tube

• Both (a) and (b)

The most active phagocytic white blood cells are

• Neutrophils and eosinophils

• Lymphocytes and macrophages

• Eosinophils and lymphocyte

• Neutrophils and monocytes