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  4. During dark reaction for fixation of carbon, where are the three carbon atoms of each molecule of 3-PGA derived from?

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Q. During dark reaction for fixation of carbon, where are the three carbon atoms of each molecule of $3-PGA$ derived from?

NTA AbhyasNTA Abhyas 2020

Solution:

The Calvin cycle or C3 cycle or dark cycle occurs in all photosynthetic plants. It is divided into 3 stages. The first stage is Carboxylation. Carboxylation is the fixation of CO2 into a stable organic intermediate. In this, CO2 is utilized for the carboxylation of RuBP. This reaction is catalyzed by the enzyme RuBisCo and it results in the formation of 2 molecules of 3-PGA (3-Phosphoglyceric acid).