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In Engelmann's experiment, very few bacteria gathered in the green region of the spectrum. This is because

  • (a) green light is absorbed by the bacteria themselves Your answer
  • (b) the alga absorbs all green light and stores it Your answer
  • (c) green light kills the aerobic bacteria quickly Your answer
  • (d) chlorophylls absorb little green light, so little O2 forms Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Chlorophylls absorb little green light, so little photosynthesis and little O2 occur there, and few aerobic bacteria gather in that region.

Why the other options are wrong

  • (a) · your answer The bacteria were not absorbing the light; they responded to O2.
  • (b) · your answer The alga absorbs little green light.
  • (c) · your answer Green light does not kill the bacteria.
NCERT point: Bacteria gathered mainly in the blue and red regions.
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