Question

Which of the following is not a product of light reaction of photosynthesis?

• A. ATP
• B. NADH
• C. NADPH
• D. Oxygen

Hint:

Products of the light reaction: \[ \boxed{ ATP + NADPH + O_2 } \] Remember: \[ \boxed{ NADP^{+} \longrightarrow NADPH } \] Do not confuse \(\mathbf{NADPH}\) (photosynthesis) with \(\mathbf{NADH}\) (cellular respiration).

Answer 1

The Correct Option is B

Light reactions of photosynthesis produce ATP, NADPH, and $O_2$ through photolysis of water and photophosphorylation. Glucose is NOT a product of light reactions; it is synthesised during the Calvin cycle (dark reactions) in the stroma using the ATP and NADPH generated in the light stage.