Question
What is photorespiration?
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Answer
In $\mathrm{C}_3$ plants some $\mathrm{O}_2$ does bind to RuBisCO, and hence $\mathrm{CO}_2$, fixation is decreased. Here the RuBP instead of being converted to 2 molecules of PGA binds with $\mathrm{O}_2$ to form one molecule and phosphoglycolate in a pathway called photorespiration. In the photorespiratory pathway, there is neither synthesis of sugars, nor of ATP. Rather it results in the release of $\mathrm{CO}_2$ with the utilisation of ATP. In the photorespiratory pathway there is no synthesis of ATP or NADPH. Therefore, photorespiration is a wasteful process.
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