Biological control includes the use of predators and parasites.

• A. Predators and parasites
• B. Chemical pesticides
• C. Mechanical methods
• D. Fertigation

Answer: (A)

Biological control uses living natural enemies to keep pest populations in check. Predators actively hunt and consume pests, such as lady beetles or lacewings that eat aphids. Parasites or parasitoids lay eggs on or in pests, and their developing offspring weaken or kill the host. This approach relies on ecological relationships to suppress pests in a sustainable way, often alongside other integrated pest management practices.

Chemical pesticides kill pests with chemicals, not living enemies. Mechanical methods involve physical actions like traps or barriers. Fertigation is about delivering nutrients through irrigation, not controlling pests biologically.