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What were the isotopes used, to research about photosynthesis?

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What were the isotopes used, to research about photosynthesis?

(a) ^11C and ^32P

(b) ^15C and ^35Cl

(c) ^13C and ^14N

(d) ^14C and ^18O

I got this question in a job interview.

My query is from Photosynthesis Basics in section Photosynthesis in Higher Plants of Biology – Class 11

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The correct option is (d) ^14C and ^18O

The explanation is: ^14C and ^18O were the isotopes used to research about photosynthesis. A plant undergoing photosynthesis produces more ^18O than normal oxygen. Also, ^14C was used to estimate the presence of carbon atoms in the photosynthesis process.

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