Identify a Reactant in the Dark Reactions of Photosynthesis

Question

Identify a reactant in the dark reactions of photosynthesis.
A) carbon dioxide
B) water
C) both carbon dioxide and water
D) neither carbon dioxide nor water

Accepted Answer

The dark reactions (aka the Calvin cycle) of photosynthesis use carbon dioxide as a reactant to produce glucose. Water is used in the light reactions of photosynthesis to generate ATP and NADPH, but it is not directly involved in the dark reactions.