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NTA Abhyas NEET2020BotanyBiological ClassificationPractice

Lichens are ecologically important as they

Options

  1. APurify air
  2. BAre pioneers on barren rocks
  3. CAre symbionts of algae and fungi
  4. DAre associated with mycorrhizal roots

Correct answer

B. Are pioneers on barren rocks

Step-by-step solution

Lichens play the role of pioneer species in primary succession on rocks. Lichens secrete acids to dissolve rocks and thus help in weathering and soil formation. Later on lichens make favourable conditions for the growth of very small plants like bryophytes, which are able to hold small amount of soil. Lichens are also SO 2 pollution indicators.

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