Which of the following is not a product of a light reaction of...

NADH is not a product of the light reaction of photosynthesis.NAD (nicotinamide adenine dinucleotide) and NADP (nicotinamide adenine dinucleotide phosphate) are the most abundant types of coenzymes inside the cell which are used as electron and hydrogen carriers. NADH and NADPH are the reduced forms of NAD and NADP, respectively. Though NADH and NADPH are structurally more similar, they differ by their role in the cell. The main difference between NADH and NADPH is that NADH is used in cellular respiration, whereas NADPH is used in photosynthesis. NADH is produced in the glycolysis and Krebs cycle and is used in the electron transport chain to produce ATP via oxidative phosphorylation.

NADPH is produced in the light reaction of photosynthesis and is used in the Calvin cycle to assimilate carbon dioxide. ATPs are produced during photophosphorylation, and oxygen is evolved during the photolysis of water.