NEET Biology question

Which one of the following equations suggests that O2 released during photosynthesis comes from water?

(A) + 12H2O --> + C6H12O6 + 6H2O18
(B)6CO2 + --> 6O2 + C6H12O6 + 6H2O18
(C) + 12H2O --> + C6H12O6 + 6H2O
(D)6CO2 + --> + C6H12O6 + 6H2O18Correct

Answer: (D)

Solution

Labelling the water (not CO2) with 18O, and observing that the evolved O2 carries the 18O label (while water regenerated during the dark reaction also carries some

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Question ID VK-128522