Question

what serves as the primary energy source for the calvin cycle? water sunlight carbon dioxide

Explanation:

The Calvin - cycle is part of the light - independent reactions of photosynthesis. ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate hydrogen) produced in the light - dependent reactions provide the energy for the Calvin cycle. Among the given options, none is correct as the main energy sources are ATP and NADPH. But if we consider the source of energy that drives the light - dependent reactions to produce these energy - carriers, sunlight is the ultimate source. Sunlight is used to generate ATP and NADPH which fuel the Calvin cycle.

Answer:

sunlight