NEET 2024 · BiologyPrevious Year 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:
Answer: (B) C, D and E only. The dark (biosynthetic) reaction does not directly require light or chlorophyll; it depends on CO2 plus the ATP and NADPH made in the light reaction.
- A.B, C and D only
- B.C, D and E only✓
- C.D and E only
- D.A, B and C only
Correct Answer
(B) C, D and E only
Solution & Explanation
The dark (biosynthetic) reaction does not directly require light or chlorophyll; it depends on CO2 plus the ATP and NADPH made in the light reaction. So of the listed items, CO2 (C), ATP (D) and NADPH (E) are needed, while light (A) and chlorophyll (B) are not directly required. Hence the correct set is C, D and E only. NCERT: Class 11 Ch 11, p.142 [142:026]: "This process does not directly depend on the presence of light but is dependent on the products of the light reaction, i.e., ATP and NADPH, besides CO2 and H2O."
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