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Question: Answered & Verified by Expert
Assertion : In light reaction of photosynthesis, light is required for the functioning of PS I and PS II, and production of NADPH and ATP.
Reason : Dark reaction does not occur in light.
BiologyPhotosynthesis in Higher PlantsAIIMSAIIMS 2015
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion.
  • B Ifboth assertion and reason are true but reason is not the correct explanation of assertion.
  • C If assertion is true but reason is false.
  • D If both assertion and reason are false.
Solution:
2394 Upvotes Verified Answer
The correct answer is: If assertion is true but reason is false.
Light reactions of photosynthesis take place in the presence of light. These involve photolysis of water and production of assimilatory power (NADPH + ATP) through PS I and PS II.
Dark reactions of photosynthesis catalyse assimilation of $\mathrm{CO}_2$ to carbohydrates. Dark reactions are light independent reactions, hence can take place both in the light as well as in the dark.

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