Back to your test review

The stage of the Calvin cycle in which CO₂ is fixed into a stable organic intermediate is

(a) photolysis Your answer
(b) reduction Your answer
(c) carboxylation Correct
(d) regeneration Your answer

Your answer: Correct answer: (c)

Advertisement

Explanation

Why (c) is correct

In carboxylation, CO₂ is fixed to RuBP to form a stable organic intermediate, 3-PGA. It is the most crucial step of the Calvin cycle.

Why the other options are wrong

(a) · your answer Photolysis is the splitting of water in the light reaction.
(b) · your answer Reduction converts PGA into carbohydrate; it does not fix CO₂.
(d) · your answer Regeneration forms RuBP again.

NCERT point: Carboxylation is catalysed by RuBisCO.

Thank you! We will check this question.

Practise Photosynthesis in Higher Plants

Take a free 15-question NEET Biology test on this chapter. Timed, scored instantly.

Start free test

Similar questions

The stage of the Calvin cycle that forms the CO2 acceptor again is C4 plants are generally adapted to The C4 pathway is also known as the