A plant hormone that is used to kill dicotyledonous weed and is also known as 'Agent Orange' is derived from

Options

A. Tryptophan
B. Phenylalanine
C. Acetyl CoA
D. Modified purines

Answer

To solve the question regarding the plant hormone used to kill dicotyledonous weeds, known as 'Agent Orange', we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Context**: The question is asking for a plant hormone that is specifically used as a herbicide to kill dicotyledonous weeds and is referred to as 'Agent Orange'.

2. **Understand 'Agent Orange'**: 'Agent Orange' is a well-known herbicide that was used during the Vietnam War, primarily to clear vegetation. It is important to note that it has significant adverse health effects.

3. **Determine the Source**: The video transcript mentions that 'Agent Orange' is derived from tryptophan. Tryptophan is an amino acid that can be converted into various compounds, including certain herbicides.

4. **Eliminate Other Options**: The transcript discusses other substances:
- **Phenylalanine**: Another amino acid, but not related to herbicides.
- **Acetyl-CoA**: Involved in metabolism, not a plant hormone.
- **Modified Purine**: Related to cytokinins, which are plant hormones but not specifically used as 'Agent Orange'.

5. **Conclude the Answer**: Based on the information provided, the correct answer to the question is **tryptophan**.

### Final Answer:
The plant hormone that is used to kill dicotyledonous weeds and is known as 'Agent Orange' is derived from **tryptophan**.

---