Question

Choose the correct answer from the alternatives given.
Photorespiration is a form of

• A. fixation of carbon dioxide in $C_4$ plants
• B. fixation of carbon dioxide in $C_3$ plants
• C. release of carbon dioxide in $C_4$ plants
• D. release of carbon dioxide in $C_3$ plants

Answer 1

The correct option is D release of carbon dioxide in $C_3$ plants

Photo-respiration is a respiratory process in many higher plants by which they take up oxygen in the light and give out some carbon dioxide, contrary to the general pattern of photosynthesis. Plants which use only the Calvin cycle for fixing the carbon dioxide from the air are known as C3 plants. C3 plants have the disadvantage that in hot dry conditions their photosynthetic efficiency suffers because of a process called photorespiration.

So, the correct option is, 'release of carbon dioxide inC3 plants'.