Which statement best describes a biological approach to weed control?

• A. It uses chemical control methods exclusively
• B. It uses living organisms to reduce weed populations
• C. It relies on heat treatment such as flaming
• D. It uses mechanical destruction with soil disturbance

Answer: (B)

Biological weed control relies on using living organisms to suppress weeds rather than relying on chemicals, heat, or physical disruption. This approach uses natural enemies—such as insects that feed on the weed, pathogens that infect it, or other organisms that inhibit its growth—to reduce the weed’s abundance, reproduction, or survival. When these organisms are host-specific and established, they can provide longer-term suppression with fewer environmental drawbacks and less risk of harming crops or leaving chemical residues.

This explanation fits the idea of using living organisms to reduce weed populations, which is why it’s the best description of a biological approach. The other methods described involve chemical controls, heat treatment, or mechanical disturbance, which are not biological in nature.