Which substance fixes carbon dioxide in the first step of the Calvin cycle?

A T P

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R u B i s C o

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N A D P H

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O_{2}

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C_{6} H_{12} O_{6}

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Solution

The correct option is D $R u B i s C o$
Calvin cycle or C3 pathway is the major pathway for the fixation of carbon dioxide in green plants. It represents the dark phase of photosynthesis and takes place in the stroma of the chloroplasts.
The first step of Calvin cycle is the carboxylation of CO₂ into a stable 3 carbon compound PGA (Phosphoglyceric Acid) with the help of enzyme RuBisCo or RuBP carboxylase oxygenase.
So, the correct answer is 'RuBisCo'.

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