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Question

In primary succession on rocks, the pioneer species are usually

A
Algae
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B
Fungi
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C
Lichens
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D
Bryophytes
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Solution

The correct option is A Lichens
Lichens are considered as pioneer species in primary succession on rocks because they can easily grow on rocks where other plants cannot grow. They produce oxalic acid which induced the weathering of rocks and thus soil is formed. When these lichens die they increase the soil fertility so other plants can grow and start the chain reaction.

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