Q35 / 200 · NEET 2022 (Phase 2) · Botany

When one $\mathrm{CO}_2$ molecule is fixed as one molecule of triose phosphate, which of the following photochemically made, high energy chemical intermediates are used in the reduction phase?

  • Correct answer
    A
    1 ATP +1 NADPH
  • B
    1 ATP +2 NADPH
  • C
    $2 \mathrm{ATP}+1 \mathrm{NADPH}$
  • D
    2 ATP +2 NADPH

Solution

During $\mathrm{C}_3$ cycle (calvin cycle) 3 phases continue, namely carboxylation, Reduction \& regeneration. During reduction or fixation phase, each $\mathrm{CO}_2$ molecule require one mole of ATP and one mole of NADPH.

Hence, the correct answer is option: 'A'.

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