NEETBotanyPhotosynthesis in Higher Plants
Match the stages of the Calvin cycle in List I with their corresponding energy requirements in List II. List I List II A. Carboxylation per CO₂ fixed I. 1 ATP B. Reduction per CO₂ fixed II. 18 ATP and 12 NADPH C. Regeneration per CO₂ fixed III. 0 ATP and 0 NADPH D. Total requirement for 1 Glucose IV. 2 ATP and 2 NADPH Choose the correct answer from the options given below:
Options
- AA-I, B-IV, C-III, D-II
- BA-III, B-IV, C-I, D-II
- CA-III, B-I, C-IV, D-II
- DA-IV, B-III, C-I, D-II
Correct answer
B. A-III, B-IV, C-I, D-II
Step-by-step solution
In the Calvin cycle: Carboxylation is the fixation of CO₂ into a stable organic intermediate and does not require ATP or NADPH. Reduction involves the utilization of 2 molecules of ATP for phosphorylation and 2 molecules of NADPH for reduction per CO₂ molecule fixed. Regeneration of the CO₂ acceptor molecule RuBP requires 1 ATP for phosphorylation. To synthesize one molecule of glucose, 6 turns of the cycle are required, consuming a total of 18 ATP and 12 NADPH. Therefore, the correct match is A-III, B-IV, C-I, D-I