Answer:
(b) Is correct, lichen
is a symbiotic association between an alga and a fungi, which live together for
their mutual benefit. If both are separated from each other then they will die.
The fungus holds water, provides protection and ideal housing to the alga.
The alga in turn
supplies carbohydrate food for the fungus. If the alga is capable of fixing
nitrogen (e.g., Nostoc), it supplies fixed nitrogen to the fungus. The kind of
mutual interdependence helps lichens to grow on dry, barren rocks, where the
other plants fail to exist. Moreover, the algae or the fungi alone cannot grow
in such places. Thus, both the partners cannot survive without each other.
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