Which hormone is produced in most plant cells as product of metabolism

Options

A. Gibberellin
B. Cytokinin
C. Auxin
D. Ethylene.

Answer

**Step-by-Step Solution:**

1. **Understanding Plant Hormones**: Plant hormones are chemical substances produced in plants that regulate growth, development, and responses to environmental stimuli.

2. **Identifying the Options**: The question provides four options: gibberellin, cytokinin, auxin, and ethylene. We need to determine which of these is produced in most plant cells as a product of metabolism.

3. **Analyzing Gibberellins**: Gibberellins are a class of plant hormones that are indeed produced in various plant tissues. They play a crucial role in promoting cell growth and elongation, as well as breaking seed dormancy and inducing germination.

4. **Analyzing Cytokinins**: Cytokinins are another class of plant hormones that primarily promote cell division (cytokinesis) but are not produced as a direct result of metabolism in most plant cells.

5. **Analyzing Auxins**: Auxins are important for cell growth and differentiation, but they are not primarily produced as a metabolic product in most plant cells.

6. **Analyzing Ethylene**: Ethylene is a gaseous plant hormone involved in processes such as fruit ripening and senescence, but it is not produced as a metabolic product in most plant cells.

7. **Conclusion**: Based on the analysis, gibberellins are the only hormones listed that are produced as a result of metabolism in most plant cells. Therefore, the correct answer is **gibberellin**.

**Final Answer**: Gibberellin

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