Question

# In C3 plants, to produce three glucose molecules .......... ATP and ........... NADPH2 molecules are required.

A
54, 36
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B
64, 30
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C
36, 60
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D
18, 12
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Solution

## The correct option is A 54, 36The net reaction of Calvin cycle is :6RuBP + 6CO2 + 18ATP + 12NADPH -----> 6RuBP + C6H12O6 + 18ADP + 12NADPH+ + 18Pi One molecule of CO2 is fixed in one C3 cycle. Thus, 6 turns of cycle are required to fix 6 molecules of CO2 i.e. to form glucose (C6H12O6).For 1 molecule of glucose ATP required are 18 and NADPH required are 12So, for 3 molecule of glucose, ATP required are equal to 3 x 18 = 54 and NADPH required are equal to 12 x 3 = 36So, the correct answer is '54, 36'.

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