Question

The products of light reaction of photosynthesis are
a. ATP and NADPH
b. ATP and glucose
c. NADH and glucose
d. ATP and NADH
e. NADPH and glucose

Answer 1

Hint: The mechanism of photosynthesis in plants takes place in two phases i.e., light and the dark phase. During the light reaction of photosynthesis, the splitting of water into oxygen, protons, and electrons takes place. The protons and electrons thus produced can be utilized to produce energy-rich compounds to further carry out the process of dark reaction.

Complete answer:
> Option (A) is correct. Light reaction of photosynthesis takes place in the thylakoids of the chloroplasts. During this process, the water molecule is splitted into oxygen, protons, and electrons. These protons and electrons are then transferred through the thylakoid membrane to produce energy storage molecules i.e., ATP and NADPH.

> Option (B) is incorrect. During the light reaction of photosynthesis, ATP and NADPH are formed. The glucose molecule is produced in the dark phase of photosynthesis.

> Option (C) is incorrect. NADH is produced during glycolysis while glucose is the product of the dark reaction of photosynthesis.

> Option (D) is incorrect. ATP is the product of the light reaction of photosynthesis while NADH is the product of glycolysis.

> Option (E) is incorrect. NADPH is the product of light reaction while glucose is the product of the dark reaction of photosynthesis.

Hence, the correct answer is option (A).

Note: Light reaction of photosynthesis takes place in the thylakoid discs of the chloroplast and produces ATP and NADPH. The dark reaction of photosynthesis takes place in the stroma of the chloroplast and produces glucose by utilizing ATP and NADPH produced during the light reaction of photosynthesis.