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Q.

Pollution indicator is

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a

Agrobacterium

b

Lichen

c

Pteridium

d

Both A and B

answer is B.

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Detailed Solution

Pollution indicator is lichen.

Lichen is not a single organism but a symbiosis among  fungus and a cyanobacterium or algae. Lichens are sensitive to atmospheric pollution. They grow in places where pollution is less to minimum. This sensitivity makes lichen a valuable biological indicator of air quality.

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Pollution indicator is