A botanist performs a series of experiments in which different possible sources of oxygen to be used by plants are radioactively labeled.When photosynthetically derived compounds are examined, their oxygen will be found to have come from which source?

Question

Quizplus · Accepted Answer

The oxygen produced during photosynthesis comes from water. This was demonstrated by experiments using oxygen-18 as a tracer, which showed that the oxygen released by plants in photosynthesis comes from water molecules, not carbon dioxide or other sources.

A Botanist Performs a Series of Experiments in Which Different