Question

What happens during the light phase of photosynthesis?

• A. ADP is hydrolysed and NADPH oxidised
• B. ADP is phosphorylated and NADP reduced
• C. ATP is hydrolysed and NADPH oxidised
• D. ATP is hydrolysed and NADP reduced

Answer 1

The correct option is B ADP is phosphorylated and NADP reduced

Light reaction is a light-dependent reaction and it is needed to produce energy molecules like ATP and NADPH. This reaction occurs in the thylakoid membrane of the chloroplast where the sunlight triggers of the reaction of chlorophyll pigment. In the process of light reaction, ATP and NADPH is produced. The product of light reaction acts as substrate for dark reaction.
ADP + Pi= ATP
NADP + $H^{+}$ = NADPH
ADP phosphorylated to produce ATP.
NADP is reduced to form NADPH.