2,4-D herbicide to control broadleaf weeds is an example of which weed control?

• A. Mechanical Control
• B. Manual Control
• C. Biological Control
• D. Chemical Control

Answer: (D)

Chemical control is being demonstrated here. 2,4-D is a herbicide, a chemical applied to plants to kill or suppress them. It works by mimicking natural plant hormones, causing uncontrolled growth in broadleaf weeds and eventual death, while grasses are largely less affected. That makes this an example of using a chemical substance to control weeds rather than removing them physically or using living organisms.

Mechanical control would involve physical methods like tillage or mowing to remove or damage weeds. Manual control is hand-pulling or other direct human labor. Biological control uses living organisms, such as insects or pathogens, to reduce weed populations.