Always associate crop varieties with their major insect pests.
Check official agricultural sources or ICAR tables for quick recall.
Avoid common confusions between closely related varieties.
1. Check the crop, variety, and associated insect pest.
2. Flat bean (Pusa A-4) is attacked by Aphids, not Fruit borer — II is mismatched.
3. Flat bean (Pusa Gaurav) is attacked by Fruit borer or leaf feeder, not Aphids — IV is mismatched.
4. Therefore, the mismatched pairs are II and IV. Hence the correct answer is (2) II & IV.