Question

Why does green plants start evolving CO2 instead of O2 on a hot summer day.Explain?​

Answer 1

On a hot sunny day, the enzyme RuBisCo carries out the oxygenation of RuBP instead of carboxylation. The compound formed is 2- phosphoglycolate which is finally converted into 3-phosphoglyceric acid with the release of oxygen. This process is known as photorespiration. The site for photorespiration is chloroplast, peroxisome and mitochondrion. Photorespiration occurs because the active site of RuBisCo for carboxylation and oxygenation is the same. At high temperature, concentration of dissolved carbon dioxide in equilibrium with air decreases more than cocentration of oxygen which favors oxygenation. Thus, at high temperature RuBisCo functions as a oxygenase and instead of fixing carbon dioxide, oxidises ribulose 1,5-bisphosphate to produce a 3-carbon phosphoglyceric acid and a 2-carbon phosphoglycolate. Phosphoglyceric acid is used up in Calvin cycle

Answer 2

Hey mate here is the answer

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➡ Green plants require CO2 for photosynthesis during the daytime. It doesn't mean they don't need oxygen, oxygen is necessary for their survival. At that time the oxygen produced as a result of photosynthesis is used by them nd not from the environment outside. But at other times of the day be it hot summer day they intake oxygen nd give out carbon dioxide just like us.

hope you are satisfied

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