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Which of the following are required for the light reaction of photosynthesis?
(A) CO2
(B) O2
(C) H2O
(D) Chlorophyll
(E) Light
Choose the correct answer from the options given below.

  • (a) A, C and E only Your answer
  • (b) C, D and E only Correct
  • (c) A and B only Your answer
  • (d) A, C, D and E only Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

The light reaction needs light, chlorophyll (to absorb it) and water (which is split to supply electrons and release oxygen). CO2 is used only later, in the Calvin cycle, and O2 is a product, not a requirement.

Why the other options are wrong

  • (a) · your answer CO2 is used in the dark reaction, not the light reaction, and chlorophyll is missing.
  • (c) · your answer Neither CO2 nor O2 is needed for the light reaction.
  • (d) · your answer CO2 is not used in the light reaction.
NCERT point: Light reaction: light absorption, splitting of water, release of O2, and formation of ATP and NADPH.
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