Photosynthesis Question 76

76. Fixation of one $CO_2$ molecule through Calvin cycle requires

[2000]

(a) 1 ATP and $2 NADPH_2$

(b) $2 ATP$ and $2 NADPH_2$

(c) $3 ATP$ and $2 NADPH_2$

(d) 2ATP and $1 NADPH_2$

Show Answer

Answer : c

Hints & Solution

(c) 2 ATP are required during conversion of PGA to 1,3-diphosphoglyceric acid and

1 ATP during conversion of glyceraldehyde phosphate to ribulose biphosphate. $2 NADH_2$ molecules are utilised for converting 1 , 3-diphosphoglyceric acid to glyceraldehyde phosphate.