Question

H${}_2$ donor during photosynthesis is

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

Answer 1

Answer: (D)

NADPH

• NADPH is the H${}_2$ donor during the process of photosynthesis. NADPH is the reduced form of NADP${}^{+}$.
  
• In photosynthetic organisms, NADPH is produced by ferredoxin NADP${}^{+}$ reductase in the last step of the electron chain of the light reactions of photosynthesis.
  
• It is used as reducing power for the biosynthetic reactions in the Calvin cycle to assimilate carbon dioxide. It is used to help turn the carbon dioxide into glucose.
  

So, the correct answer is option D.