Breathing and Exchange of Gases

People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metres have around 8 million. This is because at high altitude:

• people get pollution-free air to breathe and more oxygen is available

• atmospheric O₂ level is less and hence more RBCs are needed to absorb the required amount of O₂ to survive

• there is more UV radiation which enhances RBC production

• there is more UV radiation which enhances RBC production

What will be the number of Calvin cycles to generate one molecule of hexose?

• 4

• 6

• 8

• 9

The respiratory centre in the brain is stimulated by

• CO₂ concentration in venous blood

• O₂ concentration in artery blood

• CO₂ concentration in artery blood

• O₂ concentration in venous blood

The vital capacity of lungs is equal to

• 4000 ml

• 5000 ml

• 6000 ml

• 7000 ml

Which of the following products are obtained by anaerobic respiration from yeast?

• Alcohols

• CO₂

• Beer and Wine

• All of the above

Assertion : Severe Acute Respiratory Syndrome (SARS) originated in China.

Reason : China is the most populated country of the world.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

• If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

The majority of carbon dioxide produced by our body cells is transported to the lungs

• dissolved in the blood

• as bircarbonates

• as carbonates

• as carbonates

During anaerobic conditions, the rate of glycolysis increases, is called

• compensation point

• extinction point

• Warburg effect

• Pasteur effect

In respiration from 180g of glucose which of the following is formed?

• 264gm CO₂ + 190gm H₂O + 391 Kcal

• 264gm CO₂ + 108gm H₂O + 686 Kcal

• 390gm CO₂+ 108gm H₂O + 686 Kcal

• 390gm CO₂ + 264gm H₂O + 391 Kcal

At high altitude, RBC's of human blood will

• increase in number

• decrease in number

• decrease in size

• increase in size