Which of the following plant hormone is extracted from fungus?

Options

A. Ethylene
B. Gibberellin
C. Cytokinin
D. 2, 4-D

Answer

To answer the question "Which of the following plant hormone is extracted from fungus?" we can follow these steps:

### Step 1: Identify the Options
The options provided are:
- Ethylene
- Gibberellin
- Cytokinin
- 2,4-D

### Step 2: Analyze Each Option
- **Ethylene**: This is a gaseous plant hormone that is produced in various parts of plants like leaves, stems, and roots. It is not extracted from fungus.

- **Gibberellin**: This hormone was discovered from diseased rice seedlings affected by a fungal pathogen called *Gibberella fujikuroi*. It is indeed extracted from fungus and is known for promoting growth and elongation in plants.

- **Cytokinin**: This hormone is also associated with cell division and growth. The first cytokinin, kinetin, was isolated from a DNA degradation product but is not exclusively extracted from fungus.

- **2,4-D**: This is a synthetic plant hormone used as a herbicide and is not derived from fungus.

### Step 3: Conclusion
Based on the analysis, the correct answer is **Gibberellin** as it is the only hormone on the list that is extracted from a fungus.

### Final Answer
The plant hormone extracted from fungus is **Gibberellin**.

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