Q.

Photorespiration

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a

occurs because oxygen rather than carbon dioxide links to the rubisco enzyme in the Calvin cycle.

b

occurs more in C4 than in C3 plants under identical conditions.

c

describes the uptake of CO2 & the release of oxygen in chloroplasts.

d

All of the above

answer is A.

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Detailed Solution

Light induced CO2 liberation from a C2 compound (glycolic acid) of dark phase is called photorespiration. It occurs in green cells only. It is absent in C4 plants and present in C3 plants. Photorespiration occurs because oxygen rather than carbon dioxide links to the rubisco enzyme in the Calvin cycle. It involves three cell organelles - peroxisomes, chloroplast and mitochondria. 

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Photorespiration