NEETBotanyPhotosynthesis in Higher Plants
Match List-I with List-II regarding the energy requirements in photosynthetic pathways: List-I List-II A. Fixation of 1 C O₂ in C₃ pathway I. 3 ATP + 2 NADPH B. Synthesis of 1 glucose in C₃ pathway II. 18 ATP + 12 NADPH C. Fixation of 1 CO₂ in C₄ pathway III. 5 ATP + 2 NADPH D. Regeneration of RuBP per turn IV. 1 ATP + 0 NADPH Choose the correct answer from the options given below:
Options
- AA-III, B-II, C-I, D-IV
- BA-I, B-II, C-III, D-IV
- CA-I, B-II, C-IV, D-III
- DA-II, B-I, C-III, D-IV
Correct answer
B. A-I, B-II, C-III, D-IV
Step-by-step solution
In the C₃ pathway, the fixation of one CO₂ molecule requires 3 ATP and 2 NADPH (2 ATP and 2 NADPH for reduction, and 1 ATP for regeneration of RuBP). The synthesis of one glucose molecule in the C₃ pathway requires 6 turns of the Calvin cycle, consuming 18 ATP and 12 NADPH. In the C₄ pathway, the fixation of one CO₂ molecule requires an additional 2 ATP in the mesophyll cells, making the total requirement 5 ATP and 2 NADPH per CO₂ fixed. The regeneration of RuBP in the Calvin cycle requires exactly 1 ATP per turn a