The oxygen evolved during photosynthesis comes from splitting of
[amp_mcq option1=”water” option2=”carbon dioxide” option3=”oxygen” option4=”light” correct=”option1″]
This question was previously asked in
UPSC NDA-2 – 2018
– Experiments using isotopic tracing (specifically, using water labeled with the heavy oxygen isotope ¹⁸O) demonstrated that the ¹⁸O appeared in the evolved oxygen gas, while using carbon dioxide labeled with ¹⁸O resulted in the ¹⁸O appearing in the glucose product, not the oxygen gas.