Which one of the following pair is incorrectly matched in respect to the crop varieties for pest resistance ?

Options

A. `{:("Crop variety","Resistant to"),("Pusa Sawani","Fruit borers"):}`
B. `{:("Crop variety","Resistant to"),("Pusa Sem","Jessids and aphids"):}`
C. `{:("Crop variety","Resistant to"),("Pusa Gaurav","Aphids"):}`
D. `{:("Crop variety","Resistant to"),("Pusa Swarnim","Shoot borers"):}`

Answer

To determine which pair is incorrectly matched in respect to the crop varieties for pest resistance, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Crop Varieties and Their Resistance:**
- **Pusa Swani**: This variety is known for its resistance to fruit borers.
- **Pusa Sam**: This variety is resistant to jessids and aphids.
- **Pusa Gaurav**: This variety is resistant to aphids.
- **Pusa Swarnim**: This variety is claimed to be resistant to shoot borers.

2. **Verify Each Crop Variety:**
- **Pusa Swani**: Correctly matched as it is indeed resistant to fruit borers.
- **Pusa Sam**: Correctly matched as it is resistant to jessids and aphids.
- **Pusa Gaurav**: Correctly matched as it is resistant to aphids.
- **Pusa Swarnim**: This is where the mismatch occurs. Pusa Swarnim is actually resistant to white rust disease, not shoot borers.

3. **Conclusion:**
- The incorrect match is **Pusa Swarnim for shoot borers**. It should be matched with white rust disease instead.

### Final Answer:
The incorrectly matched pair in respect to crop varieties for pest resistance is **Pusa Swarnim for shoot borers**.

---