What did Charles Darwin and his son Francis Darwin observe about the coleoptiles of canary grass?

What did Charles Darwin and his son Francis Darwin observe about the coleoptiles of canary grass?
  1. They observed that the coleoptiles respond to unilateral illumination by growing away from the light source.
  2. They observed that the coleoptiles respond to bilateral illumination by growing towards the light source.
  3. They observed that the coleoptiles responded to unilateral illumination by growing towards the light source.
  4. They observed that the coleoptiles responded to bilateral illumination by growing away from the light source.

Solution

Charles Darwin and his son Francis Darwin observed that the coleoptiles of canary grass responded to unilateral illumination by growing towards the light source (phototropism).

Asked in: NCERT

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