Which statement about invert systems or polymers is accurate?

• A. They slow the release of pesticide over time
• B. They are used to increase spray drift
• C. They thicken spray to sink and adhere to underwater foliage and require specialized blending equipment
• D. They reduce the amount of pesticide needed by 90%

Answer: (C)

The idea being tested is how thickening agents in invert systems or polymers change a spray to improve treatment of submerged vegetation. These additives increase the viscosity of the spray so it behaves more like a thick slurry, which is less prone to surface drift and more likely to sink toward and stick to underwater foliage. That sinking and adhering to submerged plants improves coverage and effectiveness where you want the product to act. Because the spray becomes much thicker, it also requires specialized blending and dosing equipment to mix and apply it properly; regular sprayers may not handle the viscosity well, and precise control is needed to achieve the right concentration and uniform deposition.

So the statement that fits best is that they thicken the spray to sink and adhere to underwater foliage and require specialized blending equipment. They are not used to increase spray drift, they do not carry a universal 90% reduction in pesticide use, and their primary purpose isn’t to slow pesticide release over time in this context.