Which of the following molecules is both a reactant and a product of photosynthesis?

Question

Quizplus · Accepted Answer

H2O is a reactant in the light reactions of photosynthesis, where it is split to provide electrons for the electron transport chain. Oxygen is released as a product of this reaction. In the following Calvin cycle, the electrons from this reaction are used to reduce carbon dioxide to form glucose, making H2O a product of photosynthesis as well. Glucose is not a reactant in photosynthesis, but rather the product of the Calvin cycle. Chlorophyll is a pigment involved in photosynthesis, but is not a reactant or product.

Which of the Following Molecules Is Both a Reactant and a Product