Which herbicide has been the industry standard for total vegetation control since the early 1970s, with systemic action and no soil residual, and typically shows effects in seven to ten days?

Which herbicide has been the industry standard for total vegetation control since the early 1970s, with systemic action and no soil residual, and typically shows effects in seven to ten days?

• A. Roundup
• B. Diquat
• C. Granules
• D. Monument

Answer: (A)

The main idea this question tests is a herbicide’s ability to kill all vegetation through internal movement (systemic action) while leaving little or no residue in the soil, and doing so on a roughly one-week timeline. Roundup, whose active ingredient is glyphosate, fits this profile perfectly. Glyphosate is absorbed by the foliage and translocated throughout the plant, so it kills the entire organism, including roots of many perennials. It has essentially no lasting soil residue because it binds to soil particles and is rapidly degraded by soil microbes, which means it won’t persist to affect subsequent plantings. Because the plant must be actively growing for the chemical to move and disrupt essential pathways, visible symptoms and demise typically appear around seven to ten days after application. This combination—systemic action, no soil residual, and a about a week to see effects—made Roundup the industry standard for total vegetation control starting in the early 1970s. Other choices don’t fit as well: a contact herbicide acts only on surfaces it touches and acts faster but doesn’t provide the same full-plant kill, and the remaining options describe formulations or products that aren’t the established long‑term standard for broad vegetation control in turf.

The main idea this question tests is a herbicide’s ability to kill all vegetation through internal movement (systemic action) while leaving little or no residue in the soil, and doing so on a roughly one-week timeline. Roundup, whose active ingredient is glyphosate, fits this profile perfectly. Glyphosate is absorbed by the foliage and translocated throughout the plant, so it kills the entire organism, including roots of many perennials. It has essentially no lasting soil residue because it binds to soil particles and is rapidly degraded by soil microbes, which means it won’t persist to affect subsequent plantings. Because the plant must be actively growing for the chemical to move and disrupt essential pathways, visible symptoms and demise typically appear around seven to ten days after application. This combination—systemic action, no soil residual, and a about a week to see effects—made Roundup the industry standard for total vegetation control starting in the early 1970s. Other choices don’t fit as well: a contact herbicide acts only on surfaces it touches and acts faster but doesn’t provide the same full-plant kill, and the remaining options describe formulations or products that aren’t the established long‑term standard for broad vegetation control in turf.