Exam 8 SC160

Question 1 (5 points)

Which of these factors operates in a density-dependent manner?

Question 1 options:


Volcanic eruption

Food supply



Question 2 (5 points)

The temperate zones:

Question 2 options:

have the coolest climates on   Earth.

are relatively wet.

are relatively dry.

are the zones closest to the   equator.


Question 3 (5 points)

Opportunistic species typically:

Question 3 options:

are very long-living.

have a large number of offspring.

reach sexual maturity slowly.

exhibit a Type I survivorship   curve.


Question 4 (5 points)

An example of a mutualism, or +/+ relationship, is:

Question 4 options:

the relationship between corals   and unicellular algae.

cryptic coloration in frogs.


the relationship between   Virginia’s warblers and orange-crowned warblers, which use some of the same   resources.


Question 5 (5 points)

Sustainable development:

Question 5 options:

will require making difficult   decisions regarding the environment and lifestyle.

must be achieved if the human   species is to survive.

will require global, multinational   cooperation.

involves all of the above.


Question 6 (5 points)

Most decomposers are:

Question 6 options:

plants and fungi.

bacteria and plants.

fungi and prokaryotes.



Question 7 (5 points)

The effect of deforestation has been to:

Question 7 options:

decrease the amount of   carbon dioxide in the atmosphere. (Incorrect)

increase the amount of carbon   dioxide in the atmosphere.

increase the rate at which carbon   dioxide is incorporated into organic material.

increase the rate of carbon   dioxide production through cellular respiration.


Question 8 (5 points)

A regional assemblage of interacting ecosystems is a:

Question 8 options:



movement corridor.

hot spot.


Question 9 (5 points)

Which population is growing at the fastest rate?

Question 9 options:

Population A

Population B

Population C

Not enough information to tell


Question 10 (5 points)

Besides the atmosphere, abiotic reservoirs of carbon dioxide include:

Question 10 options:

fossil fuels and dissolved carbon   compounds in the oceans.

rocks and dissolved carbon   compounds in the oceans.

fossil fuels only.

rocks only.


Question 11 (5 points)

You arrive back in the United States after having visited a foreign country located on another continent. The customs agent stops the person in front of you and confiscates the fruit basket this person is bringing home. Being the knowledgeable person you are, you calmly explain to your enraged fellow traveler that the reason for the detainment is that the fruit basket may be:

Question 11 options:

carrying endangered fruit.

carrying a nonnative species that   could damage North American ecosystems.

contaminated with CFCs that will   damage the ozone layer above North America.

contaminated with sufficient DDT   to cause serious harm to anyone who eats the fruit.


Question 12 (5 points)

Which nutrients often limit the distribution and abundance of photosynthetic organisms?

Question 12 options:

Water and oxygen

Nitrogen and phosphorus

Carbon dioxide and nitrogen

Water and carbon dioxide


Question 13 (5 points)

__________ is the maximum population size that a particular habitat can support.

Question 13 options:

Crash point

Carrying capacity

Intrinsic population size

Intrinsic rate of increase


Question 14 (5 points)

A study of the human ecological footprint shows that:

Question 14 options:

we have already overshot the   planet’s capacity to sustain us.

Earth can sustain the current   population, but not much more.

Earth can sustain a population   about double the current population.

human population size will soon   crash.


Question 15 (5 points)

Which of the following is a behavioral response to environmental variability?

Question 15 options:

Migrating to a different location



"Flagging" by   trees


Question 16 (5 points)

__________ convert nitrogen from a form that can be assimilated by plants to N2.

Question 16 options:

Nitrifying bacteria

Nitrogen-fixing bacteria living in   the soil

Denitrifying bacteria

Nitrogen-fixing bacteria living in   the root nodules of legumes


Question 17 (5 points)

Aquatic organisms:

Question 17 options:

have a waxy coating to prevent   water loss.

may experience problems with water   balance.

typically have a plentiful supply   of nitrogen.

never find light to be in short   supply.


Question 18 (5 points)

What is one way in which energy flow differs from chemical cycling?

Question 18 options:

Energy flow is unidirectional;   chemical elements can be recycled.

Energy can enter but cannot leave   an ecosystem; chemical elements can leave but cannot enter an ecosystem.

Energy flows from lower to higher   trophic levels; chemicals cycle from higher to lower trophic levels.

Energy can both enter and leave an   ecosystem; chemical elements always remain within a single ecosystem.


Question 19 (5 points)

The use of the Indian mongoose to control rat populations:

Question 19 options:

shows how effective biological   control can be.

shows why integrated pest   management usually fails.

became a disaster when the   mongoose turned out to be as invasive as its target.

is an example of how coevolution   makes biological control difficult.


Question 20 (5 points)

The red-cockaded woodpecker, an endangered species, is dependent upon __________ for maintenance of its source habitat.

Question 20 options:

thick vegetation at least 15 feet   in height



corn snakes