Question

Process of assimilation of CO${}_2$ to produce carbohydrates is

• A. Oxidative
• B. Catabolic
• C. Reductive
• D. All of the above

Answer 1

The correct option is C Reductive

Photosynthesis is an oxidation-reduction process where one substance is oxidized and the other is reduced.

In this process, $H_{2}O$ is oxidized to $O_2$ in light reaction and $C{O}_2$ is reduced to $(C{H}_{2}O{)}_n$ in dark reaction using assimilatory power (ATP and NADPH) of light reaction.

The net reaction of Calvin cycle or C${}_3$ cycle is :

6RUBP + 6CO${}_2$ + 18 ATP + 12NADPH $\to$ 6RUBP + C${}_6$H${}_{12}$O${}_6$ + 18ADP + 12 NADP${}^{+}$ + 18Pi

Hence, the correct answer is 'Reductive'.