Which statement correctly matches the herbicide type to its characteristic?

• A. Selective Herbicides Kill All Plants
• B. Nonselective Herbicides Only Affect Grasses
• C. Selective Herbicides Affect Only One Plant Group, While Nonselective Affects All
• D. Nonselective Herbicides Are Harmless To All Ornamentals

Answer: (C)

Understanding herbicide selectivity means recognizing that products are designed to target certain plants while leaving others unharmed. A selective herbicide is formulated to affect only one plant group—such as broadleaf weeds—without harming the crop or turf. A nonselective herbicide has a broad spectrum and will generally kill or damage most plants it contacts. Therefore, the statement that selective herbicides affect only one plant group, while nonselective affects all, correctly captures this distinction.

This explains why the other ideas aren’t right: selective products do not kill all plants, nonselective products do not limit themselves to grasses, and nonselective products are not harmless to ornamentals.