Question

Aerosols inhibits photosynthesis by

• A. Consuming $O_2$ from air.
• B. Competing with $C{O}_2$.
• C. Blocking stomata by enhancing particulate matter settlement on the leaves.
• D. Decreasing air pollution and reducing $C{O}_2$.

Answer 1

The correct option is C Blocking stomata by enhancing particulate matter settlement on the leaves.

Tiny pores in the leaves, the stomata, are the gatekeepers that regulate how much water vapour is released to the atmosphere. But stomata also admit carbon dioxide, which is essential for photosynthetic production of energy storing sugars. Closing the stomata saves water but restricts the uptake of carbon dioxide.

So the correct option is 'Blocking stomata by enhancing particulate matter settlement on the leaves.