Question

Assertion : Under condition of high light intensity and limited CO2 supply, photorespiration has a useful role in protecting the plants from photooxidative damage.

Reason : If enough CO2 is not available to utilize light energy for carboxylation to proceed, the excess energy may not cause damage to plants.

• A. If both assertion and reason are true and reason is correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

The correct option is A If both assertion and reason are true and reason is correct explanation of assertion.

Photorespiration protects the plants from photoxidative damage by dissipating excess of excitation energy. When the carbon dioxide supply is limited and under high light intensity photorespiration takes place thus protecting the plants. If enough CO2 is not available to utilize light energy for carboxylation to proceed the excess energy may not cause damage to plants.

Therefore,both assertion and reason are true and reason is correct explanation of assertion