Question: 92. Which of the following are required for the dark reaction of photosynthesis?
A. Light
B. Chlorophyll
C. \mathrm{CO}_{2}
D. ATP
E. NADPH
Choose the correct answers from the options given below:
(1) A, B and C only
(2) B, C and D only
(3) C, D and E only
(4) D and E only
Answer: Option (3)
Explanation:
The dark reaction of photosynthesis is also known as the Calvin cycle.
It does not require light directly and therefore does not need light or chlorophyll.
In this reaction, carbon dioxide is fixed to form carbohydrates,
so \mathrm{CO}_{2} is essential.
The energy required for the reduction of carbon dioxide is supplied by
ATP produced during the light reaction.
The reducing power needed for the conversion of intermediates into carbohydrates is provided by NADPH.
Hence, the dark reaction requires \mathrm{CO}_{2}, ATP, and NADPH.
Therefore, the correct answer is option (3).