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Ingenhousz observed that small bubbles formed around the green parts of an aquatic plant in bright sunlight but not in the dark. The bubbles were of

  • (a) water vapour Your answer
  • (b) CO2 Your answer
  • (c) N2 Your answer
  • (d) O2 Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

The bubbles around the green parts in sunlight were bubbles of oxygen, released in photosynthesis.

Why the other options are wrong

  • (a) · your answer Water vapour does not form bubbles in water.
  • (b) · your answer CO2 is taken in during photosynthesis, not released in light.
  • (c) · your answer Nitrogen is not released by photosynthesis.
NCERT point: Ingenhousz showed that only green parts release O2, and only in light.
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