Unit Test — Unit test Answers

What is the source of energy in most ecosystems?

Water is an abiotic factor in terrestrial environments.

Kendra is studying the energy pyramid shown.

Echolocation is an adaptation bats use to _______. a. hunt insects in flight b. locate flowering plants c. find warm places for hibernation d. all of the above Please select the best answer from the choices provided

Which of the following did not allow researchers to further explore below the ocean’s surface?a.ROV’sb.Alvinc.Palomaresd.Bathysphere

Which of the following is a possible reason for migration?a.microevolutionb.diminished food supplyc.increased ecosystem stabilityd.macroevolution

What is a possible cause for a decrease in ecosystem productivity?a.an increase in the biodiversity of the ecosystemb.a decrease of the biodiversity of an ecosystemc.the biodiversity of an ecosystem experiencing no changed.an ecosystem becoming more stable

Which molecule would be the most affected by limited nitrogen?

Which of the following statements about the effects of agricultural techniques on the environment is true?a.Fertilizer used for agriculture can enter bodies of water, causing eventual oxygen depletion.b.Pesticides and herbicides are potentially harmful to bodies of water only before they degrade.c.Agricultural practices have limited impact on the surrounding environment.d.Tillage is an important agricultural practice that has no known environmental impact.

The open ocean, sea floor, and coral reefs are all examples of habitats with high rates of primary production.

Large-scale environmental catastrophes _______.a.result from human activitiesb.have a negative impact on ecosystemsc.affect a variety of environmental factorsd.all of the above

Which level of consumer has access to the smallest supply of energy? a. primary b. secondary c. tertiary d. quaternary Please select the best answer from the choices provided

Which of the following adaptations is typical of marine mammals?a.thick layer of blubberb.body covered in thick furc.webbed hands and feetd.breathing apparatus on the sides of the head

Wolves are predators of deer. What is most likely to happen to the deer population if the wolf population increased?

How do natural disasters weaken a community’s social infrastructure?a.Social systems are unbalanced by the damage caused by natural disasters.b.Natural disasters tend to target the poorest members of a community.c.The number of natural disasters is increasing across the globe.d.Natural disasters can cause billions of dollars in property damage.

It is best to say that the protection to properties offered by sea walls along coasts _______.a.decreases the present and future risk to human propertiesb.increases both the present and future risk to human propertiesc.decreases the present but increases the future riskd.increases the present but decreases the future risk

Review the chart, which shows the population sizes of three African animals in 1990 and in 2000. Population Estimates of Animals in Africa in 1990 and in 2000 19902000Lions100,00047,000Cheetahs25,0007,500Zebras750,000450,000Which explanation is best supported by the numbers in the chart?

Which describes a way in which phosphorus may enter into the phosphorus cycle?

Which sequence of processes transports water from the atmosphere to the ocean and then back into a cloud?

Which characteristic best distinguishes runoff and infiltration?