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Which of these is true regarding carbon dioxide fixation?(a) RuBP and CO2 give PGA(b) RuBisCO combines with CO2(c) 3 molecules of 2PGA are formed(d) RuBP acts as a catalystThis question was posed to me during an online interview.Enquiry is from Higher Plants Photosynthesis in chapter Photosynthesis in Higher Plants of Biology – Class 11

Answer»

The correct CHOICE is (a) RuBP and CO2 give PGA

Explanation: The first step of the Calvin pathway is the carbon dioxide fixation step. The carbon dioxide acceptor molecule RuBP combines with carbon dioxide to give 2 MOLECULES of 3PGA with RuBisCO as the catalyst.



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