Question

what is a by - product of the light reactions?
a h₂o₂
b nadh
c o₂

Explanation:

During the light reactions of photosynthesis, water (\(H_2O\)) is split. The oxygen atoms from water combine to form molecular oxygen (\(O_2\)), which is released as a by - product. \(H_2O_2\) (hydrogen peroxide) is not a product of the light reactions. NADH is involved in cellular respiration, not the light reactions of photosynthesis. The light reactions produce NADPH (not NADH) as an energy - carrying molecule.

Answer:

C. \(O_2\)