What is the first step of the Calvin pathway?

What is the first step of the Calvin pathway?
  1. The reaction where RuBP combines with O₂ to form phosphoglycerate and phosphoglycolate
  2. The reaction where RuBP combines with CO₂ to form 2 molecules of 3PGA
  3. The release of CO₂ from the breakdown of C₄ acid in bundle sheath cells
  4. The reaction where RuBP combines with CO₂ to form PGA

Solution

The first step of the Calvin pathway is the reaction where RuBP combines with CO₂ to form 2 molecules of 3PGA, which is catalysed by RuBisCO.

Asked in: NCERT

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