## 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
Discuss the various ways in which animals obtain oxygen.

Animals obtain oxygen in the following five ways :

1. From water or air through moist body surface directly into the body as in Amoeba.

2. From air or water through the thin body wall in blood vessels e.g. Earthworm.

3. From air through spiracles to a system of air tubes-tracheae to tissues and tissue cells or from water through tracheal gills e.g. insects.

4. From water through gill surface to blood vessels and then to tissue cell e.g. fishes and amphibians.

5. From air through moist lung surfaces to blood vessels and from there to tissue cells e.g. animals.

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

20 - 25 times
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Name the cavity having lungs.

Thoracic cavity.
448 Views

70% of carbondioxide is transported as ?

Bicarbonate
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What is the partial pressure of oxygen in  oxygenated blood ?

95 mm Hg
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Oxygen is carried by haemoglobin as?

Oxyhaemoglobin.
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