Cross protection against viral diseases in plants can be achieved by –

Correct option is A

✅ Correct option: (a)
· Cross-protection involves infecting the plant with a mild strain of a virus to protect it from a severe strain.
· It works like viral “vaccination” in plants.
❌ Other options:
· (b) Gene insertion – Genetic engineering, not cross protection.
· (c) Vector control – A management practice, not cross-protection.
· (d) Antisense technology – Molecular technique but different from cross-protection.