Question

2. Lichens are sensitive to :-

a. Nitrous oxides

b. Sulphur dioxide

C. Carbon dioxide

d. Ozone​

Answer 1

Explanation:

Lichens are sensitive to pollution and pollutants

so most probably

the ans is

C - Carbon Dioxide

hope it helps !!!

Answer 2

(b). Sulphur dioxide

because Sulphur dioxide have more adverse effect on the growth of lichens.