Respiration In Plants Question 4
Question: How many ATP and NADPH₂ are required for the synthesis of one molecule of Glucose during Calvin cycle?
(1) 12 ATP and 12 NADPH2
(2) 18 ATP and 12 NADPH2
(3) 12 ATP and 16 NADPH2
(4) 18 ATP and 16 NADPH2
Show Answer
Answer: (2) 18 ATP and 12 NADPH2
Explaination-
For every CO₂ molecule entering the Calvin cycle, 3 molecules of ATP and 2 molecules of NADPH2 are required. To make one molecule of glucose, 6 turns of the cycles are required
(6 x 3ATP = 18ATP and 6 x 2NADPH2 = 12NADPH2).
| In | Out |
|———-|————-|
| 6 CO₂ | 1 glucose |
| 18ATP | 18ADP |
| 12NADPH2 | 12NADP |
So, the correct answer is ‘18 and 12’.
