A) lichen
B) moss
C) algae
D) none of these
Correct Answer: A
Solution :
Lichens are sensitive to gases such as sulphur dioxide \[(S{{O}_{2}})\] probably due to the sensitivity of phycobiont and it can be used as indicators of air pollution. Lichens grow merrily exposed to air and light and completely shun the smoky polluted atmosphere of centres of heavy industry. Algae is a group of autotrophic, non vascular plants. These release the \[{{O}_{2}}\] during photosynthesis i. e., cleaning the air. The mosses are important soil builders. Their gregarious habit is useful for checking soil erosion. The humus formed by mosses is rich source for the growth of higher plants.
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