Question

To form one molecule of glyceraldehyde phosphate in Calvin cycle :

• A. 9 ATP and 36 NADPH are required
• B. 6 ATP and 6 NADPH are required
• C. 3 ATP and 3 NADPH are required
• D. 9 ATP and 6 NADPH are required

Answer 1

Answer: (D)

For fixation of six $C{O}_2$ molecules during Calvin cycle of photosynthesis, $18$ molecules of ATP and $12$ molecules of $NADP{H}_2$ are required.
One molecule of glyceraldehyde-$3$-phosphate. ($3$-carbon molecules) is formed by fixation of $3C{O}_2$ molecules. So $9$ ATP and $6$ NADPH molecules are required for formation of glyceraldehyde phesphate.
$3C{O}_2+6NADPH+9ATP⟶$ Glyceraldehyde-$3$ phosphatge $+6NAD{P}^{+}+9ADP+8P_i$