Question

Carbon dioxide joins the photosynthetic pathway in

• A. PS I
• B. PS II
• C. Light reaction
• D. Dark reaction

Answer 1

Answer: (D)

Dark reaction

Photosynthesis is divided into two reactions:-

1. Light reaction:-It is depended on light and occurs in grana fraction of chloroplast and in this reaction includes all those activities, which are dependent on light. Assimilatory powers like ATP and NADPH${}_2$ are mainly produced in this reaction.
2. Dark reaction:-The pathway by which all photosynthetic eukaryotic organisms ultimately incorporate CO${}_2$ into carbohydrate is known as carbon fixation, photosynthetic carbon reduction or dark reaction.

So, the correct option is 'Dark reaction'.