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The half-leaf experiment with KOH demonstrates that

  • (a) CO2 is necessary for photosynthesis Correct
  • (b) chlorophyll is necessary for photosynthesis Your answer
  • (c) O2 is released in photosynthesis Your answer
  • (d) light is necessary for photosynthesis Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

The part of the leaf deprived of CO2 (absorbed by KOH) formed no starch, while the rest did. So CO2 is necessary for photosynthesis.

Why the other options are wrong

  • (b) · your answer Both parts had chlorophyll; chlorophyll was not tested.
  • (c) · your answer Starch was tested, not O2 release.
  • (d) · your answer Both parts received light.
NCERT point: In such experiments only one factor is changed at a time.
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