Sustainability — Cumulative exam Answers

Humus creates good soil tilth, which is an indirect benefit of microorganism action.

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

Which of the following best explains how human activities can directly contribute to landslides? a. Removing plants from hillsides eliminates the root structures that anchor soil. b. Clearing trees from hills increases the frequency of rainstorms. c. Human activities tend to reduce the risk of fires. d. Landslides are not impacted by human activities. 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.

The high productivity of American agriculture is exemplified by _______.a.low crop yields per farm workerb.high crop yields per farm workerc.the small cultivated area per inhabitantd.the small cultivated area per farmer

Increases in entropy lead to _______.a.limitless work outputb.irreversible changesc.energy increasesd.all of the above

Decomposition in pools, ponds, and lakes takes place mostly in the _______ zone.a.pelagicb.littoralc.benthicd.all of the above

Trees are an important source of food for humans and other organisms.

Which of the following is not a way that oil production could potentially affect aquatic viability?a.marine oil spills during transportationb.offshore oil drillingc.interruption of water flowd.contamination from waste products

A prescribed burn is _______.a.an uncontrolled fire started by humansb.a controlled fire used to manage forest ecosystemsc.an uncontrolled natural fired.a controlled natural fire

Exposure to pesticides or industrial chemicals _______.a.always has immediate and apparent side effectsb.decreases the risk of developing genetically influenced diseasesc.increases the risk of developing genetically influenced diseasesd.has no effect on the risk of contracting genetically influenced diseases

Which of the following best explains the importance of studying the ocean carbon cycle?a.The oceans have a significant impact on the levels of atmospheric gases.b.It is a new field of ocean science.c.The ocean releases one quarter of the carbon dioxide in the atmosphere.d.All of the above

The mass of methane stored in hydrates is comparable to Earth’s coal reserves.

Which of the following is not a strategy for reducing environmental risk?a.safely disposing of wasteb.setting fines for pollutionc.remediating waste generationd.remediating contamination

Which of the following best explains why the Inuit principally relied on hunting for survival?a.Tundra never thaws sufficiently for crops to grow.b.Prey animals are more scarce in tundra regions.c.The Inuit traditionally live near the coast.d.None of the above

What characteristic is shared by both inceptisols and entisols, the soils of flood plains?a.They both have well-developed soil horizons and profiles.b.Both are young and only beginning to develop horizons and a soil profile.c.They are both at the final stage of soil development.d.None of the above

Which of the following factors will not affect a balanced physiology?a.elevationb.precipitation typec.humidityd.sun exposure

Fish rely on coral for _______.a.shelterb.food supplyc.camouflaged.all of the above

Which of the following occurs from one trophic level to another?a.energy increasesb.entropy decreasesc.biomass decreasesd.all of the above