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Question

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


A

Oxygen

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B

NADH

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C

NADPH

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D

ATP

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Solution

The correct option is B

NADH


Explanation of Correct option

(B) - NADH

  • NADH is produced in respiratory cycles.
  • NADH is a dinucleotide containing adenine and nicotinamide bases.
  • The two nucleotides are joined through 5 phosphate groups.
  • It is a coenzyme present in all living organisms and is involved in various metabolic processes such as cellular respiration.

Explanation of incorrect option

Light Reaction of Photosynthesis (or) Light-dependent Reaction:
Photosynthesis begins with the light reaction which is carried out only during the day in the presence of sunlight. In plants, the light-dependent reaction takes place in the thylakoid membranes of chloroplasts.
The Grana, membrane-bound sac-like structures present inside the thylakoid function by gathering light and are called photosystems.
These photosystems have large complexes of pigment and protein molecules present within the plant cells, which play the primary role during the process of light reactions of photosynthesis.
There are two types of photosystems: photosystem I and photosystem II.
Under the light-dependent reactions, the light energy is converted to ATP and NADPH, which are used in the second phase of photosynthesis.
During the light reactions, ATP and NADPH are generated by two electron-transport chains, water is used and oxygen is produced.
The chemical equation in the light reaction of photosynthesis can be reduced to:

2H2O+2NADP++3.ADP+3.PiO2+2.NADPH+3.ATP

Hence, Option (B) is the correct option.


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