Question

What is the effect of the high atmospheric concentration of SO₂ on a plant?

1. Golgi body destruction
2. Plasmolysis
3. Effect on photosynthesis
4. None of the above

Answer 1

Correct Answer - Option 3 : Effect on photosynthesis

• Plants are sensitive to sulfur dioxide and they are affected by it both directly and indirectly.
•  The direct effects may be acute or chronic, depending on the duration and intensity of the exposure.
•  Sulfur dioxide inhibits photosynthesis by disrupting the photosynthetic mechanism.

 

• The opening of the stomata is promoted by sulfur dioxide, resulting in an excessive loss of water. The cumulative effect of sulfurous pollution is to reduce the quantity and quality of plant yield.
• Sulfur dioxide reacts with the plant water and forms sulfuric acid.
• Sulphuric acid damages plant cells by the breakdown of chlorophyll molecule due to loss of Mg++ leading to decreased photosynthesis.