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For assimilation of one $CO_2$ molecule, the energy required in form of ATP and $NADPH_2$
A
2 ATP and 2 $NADPH_2$
B
5 ATP and 3 $NADPH_2$
C
3 ATP and 2 $NADPH_2$
D
18 ATP and 12 $NADPH_2$
Detailed Solution
In the Calvin cycle, fixing one $CO_2$ and regenerating RuBP needs:
Reduction of 2 molecules of PGA to triose phosphate: 2 ATP + 2 NADPH
Regeneration of RuBP: 1 ATP
Total per $CO_2$: 3 ATP and 2 $NADPH_2$ (for one glucose: 18 ATP and 12 NADPH).
Reduction of 2 molecules of PGA to triose phosphate: 2 ATP + 2 NADPH
Regeneration of RuBP: 1 ATP
Total per $CO_2$: 3 ATP and 2 $NADPH_2$ (for one glucose: 18 ATP and 12 NADPH).