Multiple choice

Which of the following options correctly describes greenhouse effect?

  1. The retention of heat energy by greenhouse gases

  2. When rainwater becomes acidic due to the presence of sulphur and nitogen

  3. Planting of trees in order to reduce air pollution

  4. The release of oxygen during photosynthesis

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The retention of heat energy by carbon dioxide and other greenhouse gases like cholorofluorocarbons, methane, water vapour and  oxides of nitrogen, which are present in the atmosphere, is called greenhouse effect.

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