Back to your test review

The Calvin cycle is cyclic because

  • (a) the CO2 acceptor RuBP is regenerated each turn Correct
  • (b) it alternates between day and night phases Your answer
  • (c) it occurs again and again in different cells Your answer
  • (d) CO2 is released and fixed again repeatedly Your answer
Your answer: Correct answer: (a)
Advertisement

Explanation

Why (a) is correct

The Calvin cycle is a cycle because the CO2 acceptor, RuBP, is regenerated at the end of each turn so that more CO2 can be fixed.

Why the other options are wrong

  • (b) · your answer It does not alternate between day and night phases.
  • (c) · your answer Being repeated in many cells does not make a pathway a cycle.
  • (d) · your answer CO2 is fixed, not released and re-fixed.
NCERT point: Carboxylation → reduction → regeneration → back to carboxylation.
What is wrong?
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

If 14CO2 is supplied to a C3 plant for a few seconds, the radioactivity will first appear in Which of the following is a direct product of the reduction stage of the Calvin cycle? Which pair is correctly matched with respect to the Calvin cycle?