Question

Which of the following events does not occur during the light reaction of photosynthesis?

(1) Photolysis of H${}_2$O
(2) Reduction of NADPH to NADP+
(3) Evolution of molecular oxygen
(4)Synthesis of assimilatory powers
(5)Conversion of CO${}_2$ to carbohydrates

• A. 1 and 2 only
• B. 2 and 5 only
• C. 2 ,3 and 5 only
• D. 1, 3 and 4 only

Answer 1

The correct option is B 2 and 5 only

The events occurring in the light reaction of the photosynthesis are:

1. Absorption of sunlight by the chlorophyll and release of the electron to the carriers.
2. Photolysis of water to provide the electron to the chlorophyll.
3. The release of molecular oxygen due to the photolysis of water.
4. Assimilatory powers are synthesized in the form of ATP and NADPH
5. Reduction of NADP${}^{+}$ occurs to form NADPH

The oxidation of NADPH and conversion of CO${}_2$ occurs during the dark reaction.

Hence, the correct answer is '2 and 5'.