Selective herbicides differ from non-selective herbicides in that selective herbicides?

Selective herbicides differ from non-selective herbicides in that selective herbicides?

• A. Harm most plants
• B. Are non-toxic
• C. Only harm certain plants
• D. Are always fast-acting

Answer: (C)

Selective herbicides are designed to affect only certain plant species while leaving others unharmed. This happens because these products take advantage of differences between plants—such as how the chemical is absorbed, moved, or metabolized, or the specific site of action the herbicide targets in a plant. For example, a herbicide like 2,4-D kills many broadleaf weeds but has little effect on grasses, which makes it useful in lawns or grain fields without injuring the desired grasses. In contrast, non-selective herbicides like glyphosate kill a wide range of plants, so they’re used when you want to clear an area completely. So the defining idea is that selective herbicides harm only certain plants, not most plants. They are not inherently non-toxic, and they are not guaranteed to act quickly in all cases.