Question

Which of these take place in the first step of the Calvin pathway?

(a) 3 molecules of 2PGA are formed

(b) RuBisCO combines with CO2

(c) RuBP and CO2 give PGA

(d) RuBP acts as a catalyst

I got this question during an online exam.

I'm obligated to ask this question of Higher Plants Photosynthesis in chapter Photosynthesis in Higher Plants of Biology – Class 11

Answer 1

Correct option is (c) RuBP and CO2 give PGA

Explanation: The first step of the Calvin pathway or the Calvin cycle is the carbon dioxide fixation step. The carbon dioxide acceptor molecule RuBP combines with carbon dioxide to give 2 molecules of 3PGA.