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Natural Resources — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceNatural Resources3 Marks
Question

What do you mean by biological weathering? Give two examples.

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Answer

Biological weathering refers to weathering by living organisms. Disintegration of rocks by activities of living organisms like plants grow in the cracks of rocks, break the rocks and withers them.

  • Lichens that grow on rock surface release chemical substances that cause rock to powder down and form thin layers of soil.
  • Small plants like moss live on rock surface and cause the rock to break down.

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