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The dark reactions are called light-independent because they

  • (a) take place only at night, after sunset Your answer
  • (b) are inhibited by light and stop in the day Your answer
  • (c) need no energy and no products of light Your answer
  • (d) do not use light directly but need ATP and NADPH Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

The dark reactions do not use light directly, but they depend on the ATP and NADPH made in the light reactions. That is why they soon stop after light is cut off.

Why the other options are wrong

  • (a) · your answer They do not happen only at night; they run in the day when ATP and NADPH are available.
  • (b) · your answer They are not inhibited by light.
  • (c) · your answer They do need energy (ATP) and reducing power (NADPH).
NCERT point: Light-independent ≠ dark-only.
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