Question

Photochemical smog affects plants by

• A. Bleaching of leaves and excess production of pigments
• B. Shedding of foliage and increase of transpiration
• C. Decolourising and curling of leaves
• D. Degradation of chlorophyll by ozone

Answer 1

The correct option is D Degradation of chlorophyll by ozone

Ozone is formed by resultant secondary pollutants in smog and degrades the photosynthetic pigments of leaves.

Ozone causes necrotic (dead) patterns on the upper surfaces of the leaves of trees. Ozone also can interfere with the growth and productivity of trees.

Thus, the correct answer is option D.