Question

In which process does carbon dioxide join photosynthesis?

(a) Oxidation

(b) PS I

(c) Dark reaction

(d) Reduction

This question was addressed to me during an interview.

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

Answer 1

Correct choice is (c) Dark reaction

The explanation is: Carbon dioxide is entering the photosynthetic pathway through dark reaction. RuBP reacts with CO2 to form the first unstable carbon compound. So, here 6 molecules of CO2 are required to start dark reaction.