Pesticide Applicators License Exam - Questions and Answers Endangered species organism that is on the brink of extinction throughout all or a significant
... [Show More] portion of its range Groundwater water beneath the earth's surface in soil or rock Hydrolysis a chemical reaction with water Leaching the downward movement of a pesticide through the soil Microbial action the process by which chemicals, including pesticides, are degraded by soil microorganisms, such as fungi or bacteria Non-point source pollution contamination that comes from a widespread area, such as a pesticide entering groundwater from a large-scale application Organic matter materials and debris that originated as living plants and animals Particle drift the movement of solid particles from the target area by air - may include pesticides formulated as dust or soil particles to which pesticides are attached Permeability measurement of the ease with which water and dissolved particles can flow through porous materials, such as soil, sand, and gravel Photodegradation Breakdown of chemicals by the action of sunlight Point-source pollution Contamination that comes from a specific identifiable place, such as a pesticide entering a storm sewer Residue the pesticide that remains in the environment after its application or a spill Runoff surface movement of a pesticide in water from the treated site Secondary poisoning harm caused to predators from feeding on plants or animals carrying pesticide residues Solubility a measure of the ability of a pesticide to dissolve in a solvent, usually water Spray drift the off-target movement of small, liquid spray pesticide droplets from the application site Surface water water on top of the earth's surface, such as a lake, stream, or irrigation ditch Temperature inversion condition that exists when the air at ground level is cooler than the temperature of the air above it. condition is conducive for pesticide drift Threatened species organism that is likely to become endangered in the foreseeable future Tolerance the maximum amount of a pesticide that may remain on or in raw agricultural commodities Vapor drift the off-target movement of pesticides as gaseous vapors from the target site Viscosity the thickness of a liquid or a measurement of its resistance to flow Volume median diameter (VMD) term used to indicate the relative droplet size of a volume of spray from a nozzle Acute toxicity the measure of harm caused by a single, one-time exposure event Carcinogenesis the production of malignant tumors Cholinesterase a chemical enzyme found in humans and many other animals that regulates the activity of nerve impulses Chronic toxicity the harmful effects that may occur from small, repeated doses of a substance over time Exposure Entry of a pesticide into the body thro [Show Less]