Assertion :Crustose lichens, in a lithosere, secrete organic acid causing the weathering of rocks so that minerals essential for proper growth of lichens are released. Reason: Early colonists in a primary succession are usually lichens, which suggests that colonisation is easier when an organism has a mutualistic association.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The pioneer community in a lithosere (biotic succession on bare rock) is constituted by lichens. The pioneer lichens are usually crustose lichens. Lichen can tolerate desiccation. They produce organic acids which cause weathering of rocks so that minerals essential for proper growth of lichens are released. Lichens hold the fine particles of rock and initiate soil formation. It paves the way for growth of next seral community. Lichens are dual organisms which contain a permanent symbiotic association of a fungus and an alga. Early colonisation by lichens suggests that colonisation is easier when the organism has mutualistic association.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.

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