Which statement is wrong about lichens?

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(C) The correct answer is $C$. Lichens are extremely slow-growing organisms. They do not grow at a rate of $2 \ cm$ per day; rather,they typically gro

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They grow rapidly about $2 \ cm$ per day

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(C) The correct answer is $C$. Lichens are extremely slow-growing organisms. They do not grow at a rate of $2 \ cm$ per day; rather,they typically grow at a very slow rate,often around $1 \ mm$ per year. The other statements are correct: some species like $Cladonia$ (reindeer moss) are consumed by reindeers,they are well-known bio-indicators of air pollution (especially $SO_2$),and they represent a symbiotic association between an algal component (phycobiont) and a fungal component (mycobiont).

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$A$: Lichens do not grow in polluted areas having $SO_2$.
$R$: Lichens secrete carbonic acid and oxalic acid on barren rocks.

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