To solve the question regarding the incorrect statement about P, Q, R, S, and T based on the provided dichotomous key, we can follow these steps:
### Step-by-Step Solution:
1. **Identify the Types of Fibers**:
- From the key, we know:
- **P**: Man-made fiber
- **Q**: Obtained from stem (e.g., jute)
- **R**: Obtained from fruit (e.g., cotton)
- **S**: Obtained by killing the source organism (e.g., silk)
- **T**: Obtained without killing the source organism (e.g., wool)
2. **Analyze Each Statement**:
- We need to evaluate the statements regarding these fibers to find the incorrect one.
- **Statement about P**: "Fiber of P burns quickly." This is true for synthetic fibers.
- **Statement about Q**: "Q could be obtained from Corchorus capsularis." This is true, as jute comes from this plant.
- **Statement about R**: "R could be obtained from Gossypium hirsutum." This is true, as cotton comes from this plant.
- **Statement about S**: "Fabric made of S can be worn in all seasons." This is likely false, as silk is generally not suitable for all seasons.
- **Statement about T**: "Fabric made of Q can be used to make a raincoat." This is false, as jute is not typically used for raincoats.
3. **Determine the Incorrect Statement**:
- The statements about S and T are both suspect. However, the statement about T is particularly incorrect because jute is not waterproof and cannot be used to make effective raincoats.
4. **Conclusion**:
- The incorrect statement is: "Fabric made of Q can be used to make a raincoat."
### Final Answer:
The incorrect statement regarding P, Q, R, S, and T is: "Fabric made of Q can be used to make a raincoat."
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