Biology · Plant Growth and Development
The initial experiments by Charles Darwin and Francis Darwin on phototropism demonstrated that: I. The coleoptile bends towards unilateral light. II. The bending is caused by a transmittable influence from the coleoptile tip. III. Auxin is the direct chemical responsible for the phototropic bending.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1I only
- 2II only
- 3I and II only✓
- 4I, II, and III
Correct answer
I and II only
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