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Natural Resources — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceNatural Resources1 Mark
Question

Which are sensitive to SO2 pollution?

  1. Mosses.
  2. Lichens.
  3. Algae.
  4. Ferns.
✓

Answer

  1. Lichens.

Explanation:

Sulphur dioxide is a gas that dissolves in water and produces acidic ions that are highly reactive. When lichen absorb this gas, it disrupts photosynthesis, inhibits reproduction and other activities.

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