Question

what compound provides the reducing power for the calvin cycle reactions?
atp
fad
fadh2
nadph
co2

Explanation:

In the Calvin cycle (light - independent reactions of photosynthesis), NADPH (nicotinamide adenine dinucleotide phosphate - hydrogen) is the compound that provides reducing power. ATP provides energy in the form of phosphate groups. FAD and FADH₂ are involved in cellular respiration (e.g., in the electron transport chain of mitochondria). CO₂ is the substrate that is fixed in the Calvin cycle, not a source of reducing power.

Answer:

NADPH