AnswersCA-Life Science B High SchoolPopulation Size and Structure

Population Size and Structure — Unit test Answers

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1
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How do limiting factors most affect population size?

A
stop population growth
B
restrict population growth
C
increase population growth
D
decrease population growth
2
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A population of zebras experienced ten births, six deaths to predation, three deaths to disease, three individuals joining the population, and zero individuals leaving. What is happening to the population growth?

A
It is increasing.
B
It is decreasing.
C
It is staying the same.
D
It reaches carrying capacity.
3

How does mining impact the environment?

A
It has a positive impact on the environment by permanently altering the ecosystem.
B
It has a positive impact on the environment by releasing chemicals into the environment.
C
It has a negative impact on the environment by allowing toxic chemicals to harm wildlife.
D
It has a negative impact on the environment by providing new niches for wildlife to inhabit.
4

Which statement best describes the purpose of Earth's spheres?

A
They work together as open systems to cycle matter through ecosystems.
B
They work independently as closed systems to cycle matter through ecosystems.
C
They work together as open systems to move matter to living and nonliving parts of Earth.
D
They work independently as closed systems to move nutrients to living and nonliving parts of Earth.
5

How would a harsh winter most likely affect the rabbit population size?

A
population decreases
B
population increases
C
population reaches carrying capacity
D
population completely dies off
6

The coyote's diet includes a wide variety of small mammals, livestock, birds, reptiles, carrion, fruit, and vegetables. It is one of the few animals that has enlarged its range since human encroachment began. Which is the most likely reason for this?

A
It has adapted its diet to include more variety, thereby increasing its food supply.
B
It has intermingled with human pets, such as the dog, to increase its population.
C
It has migrated to ranges with more favorable, moderate climates.
D
It has an increase in nest and shelter sites within the urban and rural range.
7

The Great Pacific Garbage Patch is an area in the North Pacific Ocean that contains trash and causes harm to ocean life and those that consume that life. What lessons can be learned from this floating pile of trash?

A
There is no relationship between our daily activities and the environment.
B
There are more polluters in the Pacific Ocean than in the Atlantic Ocean.
C
There are areas of the ocean to avoid with boats.
D
There is a relationship among all living things on Earth.
8

Pandas eat bamboo for energy. What are pandas classified as?

A
producers
B
consumers
C
decomposers
D
autotrophs
9

The tundra ecosystem of Alaska is known as a “cold desert.” It receives very little precipitation, about four inches annually. However, it is rich in wetlands due to permafrost, which traps moisture close to the surface. The temperatures vary widely, also producing persistent winds. Although treeless, the Arctic tundra is an abundant ecosystem. Many organisms find their niche here including many migratory bird species and mammals such as caribou, foxes, bears, and small rodents. Which factor of the tundra ecosystem is biotic?

A
wind
B
dead bird
C
carbon dioxide
D
temperature
10

Which statement best compares the carbon cycle and the nitrogen cycle?

A
Both cycle water from Earth's surface to the atmosphere.
B
Both involve the work of decomposers.
C
Both release oxygen as a waste product.
D
Both require fixation in order to convert molecules.
11

What most likely happened to the population of deer in 1963 and 1964?

Question illustration
A
The population increased its death rate.
B
The population exceeded past carrying capacity.
C
The population crashed down to 0.
D
The population steadily increased to get closer to carrying capacity.
12

A family released their pet fish family into a local pond. The fish had no known local population. The impact of the fish on the ecosystem is not yet known. Which term would best define the fish added to the pond?

A
invasive species
B
introduced species
C
native species
D
symbiotic species
13

What could explain the curve in this population growth graph?

Question illustration
A
an unlimited food supply
B
a natural disaster
C
a population crash
D
a reduction in predators
14

Barnacles and whales have a commensalistic relationship in which barnacles benefit. What would most likely happen to the whale population if the barnacle population decreased?

A
become extinct
B
decrease
C
increase
D
stay the same
15

Natural resources are classified as renewable and nonrenewable. What is the difference between the two?

A
whether or not the resource exists in nature
B
whether or not the resource can be replaced
C
whether or not the resource dwindles in supply
D
whether or not the resource is useful to humans

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