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Assertion : When six molecules of carbon dioxide participate in photosynthesis, 12 molecules of $\mathrm{NADP}^{+}$and $18 \mathrm{ATP}$ are used up, forming one hexose molecule.
Reason : The photosynthetic light reaction results in the formation of ATP and NADPH.
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Reason : The photosynthetic light reaction results in the formation of ATP and NADPH.
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If both assertion and reason are true but assertion is not a correct explanation of the assertion.
When six molecules of carbon dioxide enter Calvin cycle, one hexose molecule is formed, whereas 18 ATP and $12 \mathrm{NADP}^{+}$molecules are used up. The light reaction of photosynthesis results in the formation of ATP and NADPH.
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