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Air — Social Studies STD 7 — Question

CBSE BoardEnglish MediumSTD 7Social StudiesAir2 Marks
Question
How is carbon dioxide useful?
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Answer

  1. Green plants use carbon dioxide to make their food and release oxygen.
  2. Humans or animals release carbon dioxide.
  3. The amount of carbon dioxide released by humans or animals seems to be equal to the amount used by the plants which make a perfect balance.
  4. However, the balance is upset by burning of fuels, like coal and oil. All this affects earth’s weather and climate.

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