Who isolated auxin from coleoptile seedling for the first time -

Options

A. Darwin
B. Miller
C. Skoog
D. F. W. Went

Answer

**Step-by-Step Solution:**

1. **Understanding Auxin**: Auxin is a type of plant hormone that plays a crucial role in regulating plant growth and development. It is classified as a phytohormone.

2. **Historical Context**: The discovery of auxin can be traced back to experiments conducted by Charles Darwin and his son, Francis Darwin. They studied the phenomenon of phototropism, which is the growth response of plants toward light.

3. **Phototropism Experiment**: In their experiments, they observed that when light was directed at one side of a plant (specifically, the coleoptile of canary grass), the plant would bend toward the light source. This bending is due to the unequal distribution of auxin, which promotes growth on the side of the plant that is away from the light.

4. **Isolation of Auxin**: The first successful isolation of auxin from coleoptile seedlings was accomplished by F.W. Went. His work built upon the earlier observations of the Darwins and led to the identification of auxin as the hormone responsible for the phototropic response.

5. **Conclusion**: Therefore, the answer to the question of who isolated auxin from coleoptile seedlings for the first time is F.W. Went.

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