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Air — Social Science STD 7 — Question

Rajasthan BoardEnglish MediumSTD 7Social ScienceAir3 Marks
Question
How is nitrogen a constituent of the atmosphere?
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Answer

  1. Nitrogen is the most plentiful gas in the air.
  2. When we inhale, we take some amount of nitrogen into our lungs and exhale it.
  3. But plants need nitrogen for their survival.
  4. They cannot take nitrogen directly from the air.
  5. Bacteria, which live in the soil and roots of some plants, take nitrogen from the air and change its form so that plants can use it.

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