Question

Which of the following are required for the dark reaction of photosynthesis?
A. Light
B. Chlorophyll
C. CO₂
D. ATP
E. NADPH
Choose the correct answer from the options given below:

• A. A, B and C only
• B. B, C and D only
• C. C, D and E only
• D. D and E only

Answer 1

The Correct Option is C

The dark reaction, also known as the Calvin cycle, does not require light directly but depends on the products of the light reactions. The dark reaction requires:
CO₂ (C): Acts as the substrate for carbon fixation.
ATP (D): Provides the energy needed for the reactions.
NADPH (E): Supplies the reducing power for the conversion of 3-phosphoglycerate into G3P.
Step 1: Light and chlorophyll are essential for the light reactions, but they are not directly required for the dark reactions.
Thus, the correct answer is (3) C, D, and E only.