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Plants adapted to low light intensity have

  • (a) a more extensive root system Your answer
  • (b) a higher rate of CO2 fixation than sun plants Your answer
  • (c) leaves modified into spines Your answer
  • (d) a larger photosynthetic unit size than sun plants Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Shade (low light) plants have a larger photosynthetic unit, that is more antenna (light-harvesting) pigment molecules per reaction centre, so they can trap more of the little light available.

Why the other options are wrong

  • (a) · your answer Root system size is not the adaptation to low light.
  • (b) · your answer Shade plants have a lower rate of CO2 fixation than sun plants.
  • (c) · your answer Spiny leaves are an adaptation to dry habitats, not to shade.
NCERT point: Each photosystem has a light-harvesting complex of hundreds of pigment molecules around a reaction centre.
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