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Ecosystems and Energy Flow — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYEcosystems and Energy Flow4 Marks
Question
Usually crustose lichens form a pioneer species.
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Answer

  1. The pioneer species is the one which invades a bare area.
  2. When primary succession occurs it takes place on rocks.
  3. The crustose lichens can secrete acids which can dissolve rocks. This starts weathering of rocks and soil formation.
  4. Further, bryophytes and mosses can take hold of such soil. Therefore, as a pioneer on the barren rocks only crustose lichens can grow.

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