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Assertion (A): The light reaction is also called the photochemical phase of photosynthesis.
Reason (R): In this phase, light energy is used to split water and to form ATP and NADPH.

  • (a) Both A and R are true, and R is the correct explanation of A. Correct
  • (b) Both A and R are true, but R is not the correct explanation of A. Your answer
  • (c) A is true but R is false. Your answer
  • (d) Both A and R are false. Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Both are true and R explains A. The light reaction is called photochemical because light energy is used directly to split water and to form ATP and NADPH.

Why the other options are wrong

  • (b) · your answer R gives the very reason for the name.
  • (c) · your answer R is true.
  • (d) · your answer Both are true.
NCERT point: Photochemical phase: light → chemical energy (ATP, NADPH).
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