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The historical experiment on canary gras...

The historical experiment on canary grasses coleoptile as a first step in the discovery of auxin was conducted by-

A

Darwin

B

Went

C

Kog

D

Kurosawa

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Experiment**: The historical experiment in question involves the study of the coleoptile of canary grasses. The coleoptile is the protective sheath covering the emerging shoot of a seedling. 2. **Identifying the Researchers**: The experiment was conducted by Charles Darwin and his son, Francis Darwin. They were investigating how plants respond to light. 3. **Observing Phototropism**: The key finding from their experiment was the phenomenon of phototropism, which is the growth of a plant in response to light direction. They observed that when light was directed at one side of the coleoptile, the shoot would bend towards the light. 4. **Mechanism of Action**: The bending of the coleoptile towards light is due to the distribution of auxin, a plant hormone. Auxin accumulates on the side of the plant that is away from the light, causing that side to elongate more than the side facing the light, resulting in bending. 5. **Conclusion**: The experiment conducted by Charles and Francis Darwin was pivotal in the discovery of auxin and understanding plant growth responses to environmental stimuli. **Final Answer**: The historical experiment on canary grasses coleoptile as a first step in the discovery of auxin was conducted by Charles Darwin and his son Francis Darwin. ---
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