Topic Test Answers

How can failing to conserve water contribute to greater water contamination?a.Overirrigating fields causes an increase in pollution that results from runoff.b.Natural water filters are depleted by the overuse of water.c.Sewage systems are more likely to fail due to greater demand, causing higher chances of water contamination.d.All of the above

Why has the spread of the herbicide-resistant hydrilla through Florida’s waterways resulted in them no longer being navigable by most boats?a.Thy hydrilla has induced a drought that drained the waterways.b.The weed clogs propellers that boats use for propulsion.c.The sticky leaves of the weed hold boats in place.d.All of the above

Why are cane toads in Australia considered an invasive species rather than simply nonnative?a.They are destructive to native species and have no natural predators.b.They reproduce more quickly than native species.c.They have venom glands.d.Large adult specimens are able to hunt snakes.

Which of the following might occur if people fail to conserve water? a. increased sewage system failures b. increased numbers of natural pollution filters c. increased water supply d. increased wildlife habitats Please select the best answer from the choices provided

Which of the following is true concerning sources of water pollution?a.Mine wastes and heavy metals become water pollution through storm water runoff.b.Biodegradable materials like food, wood, and leaves are not considered pollution.c.Petroleum byproducts and fuels end up as pollution principally from oil spills.d.Pesticides and herbicides do not commonly become water pollutants.