18. Find the odd one out w.r.t. lichens
(1) They are composed of phycobiont and
mycobiont
(2) The autotrophic component of lichens
prepare food for heterotrophic component
(3) They are pioneer colonisers of barren rocks
(4) Lichens can grow easily in SO2 polluted
areas
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Odd one out about lichens is -
(4) Lichens can grow easily in SO2 polluted areas
Lichens are the complex of cyanobacteria and fungus. The cyanobacteria is called phycobiont while fungal part is known as mycobiont.
Lichens lack roots, thus their mode of receiving nutrients is atmosphere. Lichens are also sensitive towards pollutants and hence, they are bio indicators.
This means their growth in any area marks presence of pure air.
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