Question

Pollution indicator plants are/can
a. Resistant to pollution
b. Purify the atmosphere
c. Very sensitive to pollution
d. Indicate the onset of rains

Answer 1

Hint: Plants can effectively be used as cheap and naturally available monitoring systems or bioassays of the extent and sort of air, soil, and pollution in a neighborhood, and concentration of a pollutant are often reliably acknowledged by various characteristics. Damage symptoms are produced within the plants because such damage symptoms are pollutant specific also as concentration-specific.

Complete answer:
Man-made air pollutants are a recent phenomenon within the evolutionary experience of plants and animals. The natural air pollutants from volcanic eruptions, forest fires, and mud storms also created pollution s. Plants have undergone increasing concentrations of such pollutants like sulfur dioxide, fluorides, nitrates, iodides, lead, and many more. Lichens and bryophytes serve as the best example to show pollution. These pollution indicators are very sensitive to pollution. So, option C is correct

Pollution indicator plants act as a measure of indicating pollution. They show symptoms of pollution. So, option A is incorrect.

Pollution indicator plants show a great variation in their morphological and anatomical characteristics. So, option B is incorrect.

Pollution indicator plants do not indicate the onset of rain. SO, option D is incorrect.
A good deal of genetic variation occurs within crops, and this enables for selection of pollution-tolerant varieties.

Hence, the correct answer is option (C).

Note: Pollution indicators are sensitive and show various symptoms to indicate pollution. Lichens show the pollution of sulfur dioxide. The nature of specific adaptations isn't generally documented although, for sulfur dioxide, recent studies in poplar and spinach strongly suggest that increased production of the enzyme superoxide dismutase may be a key factor. In other adaptations, morphological and anatomical features play a part.