## Chapter Chosen

Breathing and Exchange of Gases

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CBSE Gujarat Board Haryana Board

## Previous Year Papers

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Class 10 Class 12
What happens to respiratory process in man going up a hill ?

As altitude increases, the oxygen level in the atmosphere decreases. Therefore, as a man goes uphill, he will suffer from oxygen deficiency. This causes the amount of oxygen in the blood to decline. The respiratory rate increases to compensate for the decrease in the oxygen level of blood. Simultaneously, the rate of heart beat increases to increase the supply of oxygen to blood.

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By what amount the solubility of carbondioxide is more than the solubility of oxygen?

20 - 25 times
414 Views

Name the cavity having lungs.

Thoracic cavity.
448 Views

Oxygen is carried by haemoglobin as?

Oxyhaemoglobin.
415 Views

What is the partial pressure of oxygen in  oxygenated blood ?

95 mm Hg
702 Views

70% of carbondioxide is transported as ?

Bicarbonate
360 Views