INSIGHT UPSC QUIZ

Science & Technology General Science
Q.

 Water vapour present in the atmosphere is formed due to which of the following factors?

1. Heating of water bodies.

2. Activities of living organisms.

3. Weathering of rocks.

4. Photosynthesis.

Select the correct answer using the code given below:

Explanation:

ANSWER: (B)

  • Water vapour is formed due to the heating of water bodies and the activities of living organisms. 
  • The atmosphere can be heated from below by the radiation that is reflected back or re-radiated by the land or water bodies. On being heated, convection currents are set up in the air. 
  • Plants and photosynthetic algae and bacteria use energy from sunlight to combine carbon dioxide (C02) from the atmosphere with water (H2O) to form carbohydrates. 
  • These carbohydrates store energy. Oxygen (O2) is a by-product that is released into the atmosphere. This process is known as photosynthesis.
  • carbon dioxide + water + sunlight -> carbohydrate + oxygen
  • Weathering of rocks releases minerals into the soil. There are no water vapour deposits in rocks.

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