Describe the difference between selective and non-selective herbicides.

• A. Selective herbicides do not control certain types of plants (like monocots), while non-selective herbicides control all plants.
• B. Selective herbicides kill all plants; non-selective kill only weeds.
• C. Selective herbicides remain in soil; non-selective dissipate quickly.
• D. Selective herbicides are contact; non-selective are systemic.

Answer: (A)

The main idea is how broadly a herbicide affects different plants. Selective herbicides are aimed at specific plant types, letting the crop survive and keeping certain weeds under control. They work because some plants share a vulnerability that others, like the crop, don’t. Non-selective herbicides, on the other hand, are broad-spectrum and kill most vegetation they contact, which is why they’re used when you want to clear an area completely.

The statement aligns with that: selective herbicides don’t control certain plant groups while non-selective herbicides control all plants. In practice, which plants are affected depends on the product and the crop tolerance. The main contrast is spectrum of activity, not necessarily how the herbicide moves in the plant or how long it stays in the soil.