Question

Lichens indicate SO₂ pollution because there

(a) show association between algae and fungi

(b) grow faster than others

(c) are sensitive of SO₂

(d) flourish in SO₂ rich environment

Answer 1

Correct option  (c) are sensitive of SO₂

Explanation:

Lichens, the composite organisms consist of a specific fungus living in symbiotic association one or sometimes, two species of algae. Lichens are worldwide in distribution these are pioneer colonists of barred rocks and mountains. Being extremely sensitive to SO₂ the lichens especially epiphytic lichens serve as bioindicators air pollution.