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NEET 2016 Phase 1 · BiologyPrevious Year Question

(Out of current syllabus — rationalised out of NCERT; included as it was asked in earlier NEET papers) Which of the following would appear as the pioneer organisms on bare rocks?

Answer: (A) Lichens. Answer: (A) (Out of current syllabus — rationalised out; last asked ≤2023) On bare exposed rock (a lithosere/xerarch sere) the very first colonisers are lichens, the pioneer community.

  1. A.Lichens✓
  2. B.Liverworts
  3. C.Mosses
  4. D.Green algae

Correct Answer

(A) Lichens

Solution & Explanation

Answer: (A) (Out of current syllabus — rationalised out; last asked ≤2023) On bare exposed rock (a lithosere/xerarch sere) the very first colonisers are lichens, the pioneer community. They secrete acids that dissolve and weather the rock, releasing minerals and trapping detritus to form a thin soil that later supports mosses and higher plants. Liverworts, mosses and green algae need pre-formed moisture or soil and so appear only at later seral stages, not on the bare rock itself. NCERT Reference: Class XII, Ecosystem — ecological succession (pre-2023 NCERT; rationalised out of current reprint).

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