Reduction in pH of blood will

• reduce the blood supply to the brain

• decrease the affinity of haemoglobin with oxygen

• release bicarbonate ions by the liver

• release bicarbonate ions by the liver

Blood pressure in the pulmonary artery is

• more than that in the carotid

• more than that in the pulmonary vein

• less than that in the Vena cava

• less than that in the Vena cava

The diagram given here is the standard ECG of a normal person. The P- wave represents the

• Contraction of both the atria

• initiation of the ventricular contraction

• the beginning of the systole

• the beginning of the systole

Which one of the following animals has two separate circulatory pathways?

• Frog

• Lizard

• Whale

• Whale

Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when

• AB valves open up

• Ventricular walls vibrate due to gushing in of blood from atria

• Semilunar valves close down after the blood flows into vessels from ventricles

• Semilunar valves close down after the blood flows into vessels from ventricles

A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor

• Blood group B

• Blood group AB

• Blood group O

• Blood group O

In which one of the following options the two examples are correctly matched with their particular type of immunity?

• Examples	Type of immunity
  Polymorpho-nuclear leukocytes and monocyte	Cellular barriers

• Examples	Type of immunity
  Anti-tetanus and anti-snake bite injections	Active immunity

• Examples	Type of immunity
  Saliva in mouth and Tears in eyes	Physical barriers

• Examples	Type of immunity
  Saliva in mouth and Tears in eyes	Physical barriers

Which one of the following is wrong statement?

• Anabaena and Nostoc are capable of fixing nitrogen in free-living state also

• Root nodule forming nitrogen fixers live as aerobes under free-living conditions

• Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins

• Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins

People who have migrated from the planes to an area adjoining Rohtang Pass about six months back 

• Have more RBCs and their haemoglobin has a lower binding affinity of O₂

• are not physically fit to play games like football

• Suffer from altitude sickness with symptoms like nausea, fatigue, etc

• Suffer from altitude sickness with symptoms like nausea, fatigue, etc

Which one of the following human organs is often called the “graveyard” of RBCs?

• Gall bladder

• kidney

• Spleen

• Spleen