Issues Affecting Marine Ecosystems Answers

Introduced sewage in water systems _______.a.decreases levels of phosphorus and nitrogenb.increases oxygen levelsc.increases concentrations of solidsd.leads to decreases in the temperature

Changing your toilet can reduce water pollution because _______.a.the sewage is partially treated in the toilet before entering the sewer systemb.chemicals added by new toilets neutralize the pathogens in the waterc.more efficient plumbing uses more water and creates larger volumes of wasted.more efficient plumbing uses less water and creates smaller volumes of waste

Which of the following is the most serious effect of water pollution for humans?a.infectious diseasesb.algal bloomsc.toxic food chain effectsd.low-oxygen water

Which of the following best describes the effects of water pollution on aquatic ecosystems?a.It can result in fish kills and restrictions on human consumption.b.It can change the physiology of fish.c.It can cause long-term alterations of aquatic ecosystems.d.All of the above

The principle difference between point source and nonpoint source water pollution is _______.a.whether the pollution is organic or inorganicb.the number of sources of pollutionc.the amount of pollutiond.whether it is from commercial or agricultural sources

To be considered a source of water pollution, the source must include a chemical. Please select the best answer from the choices provided

Which of the following best describes pollution discharged by cruise ships?a.Cruise ships only discharge sewage and liquid wastes.b.Cruise ships discharge sewage, solid, liquid, and air pollution.c.It is illegal for cruise ships to discharge untreated sewage in the ocean.d.Cruise ships do not discharge oil or petroleum waste.

Nonpoint source pollution is difficult to control because it _______.a.comes from a direct point of originb.comes from a variety of sourcesc.remains the same over timed.none of the above

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.

Using a broom to clean sidewalks and driveways is a way to reduce water pollution.

Which of the following is not a cause of water pollution?a.jet fuelb.laundry soapc.ammoniad.none of the above

How does de-icing roads with salt negatively impact the environment?a.The road salt attracts deer that are then hit by motor vehicles.b.It removes necessary salt from the local water courses.c.The high salinity of the surface runoff is harmful to freshwater ecosystems.d.The salt harbors salt eating bacteria that are toxic to animals.

Surface runoff is an example of nonpoint source pollution.

Algal blooms, and the rapid proliferation of photosynthetic plankton can ultimately end up depleting all the oxygen from a body of water.

Which of the following is true about impervious building materials?a.Impervious surfaces prevent pollutants from entering the water supply.b.Vegetation and gravel are common impervious materials.c.Having fewer impervious surfaces improves water drainage.d.All of the above

Which of the following factors determines how harmful an introduced chemical will be on the environment?a.type of chemicalb.concentrationc.weather conditionsd.all of the above

The toxic effects of water pollution are generally _______.a.immediate and long-lastingb.immediate and short-livedc.delayed and long-lastingd.delayed and short-lived

Point source pollution is much more difficult to track and clean up than nonpoint source pollution.