AnswersTX-Biology B-CRUnit Test

Unit Test — 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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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
3

Water exits the leaves of plants and enters the atmosphere. What is this process called?

A
photosynthesis
B
condensation
C
transpiration
D
precipitation
4

Humans affect the carbon cycle in many ways through the use of fossil fuels, clear cutting of forests, and controlled burns. Which process can help counteract these human interactions?

A
photosynthesis
B
respiration
C
decomposition
D
building proteins
5

Humans process some foods by adding chemicals to reduce harmful bacterial growth. This allows foods to be edible for longer periods of time. Which best describes the advantages of food processing?

A
control of density-independent limiting factors such as disease spread
B
control of density-dependent limiting factors such as disease spread
C
control of density-dependent limiting factors such as predation
D
control of density-independent limiting factors such as predation
6

A population of wolves in Wyoming experienced a rapid decline. Scientists found that 20 wolves died from rabies, 15 wolves died from mange (a parasitic mite), and 10 wolves died from natural causes. Wyoming experienced a recent drought, and many populations, including deer, bison, and bear, have diminished in the past year. What is best described in this scenario?

A
Wolves reached their greatest population growth.
B
Wolves were exposed to too many limiting factors.
C
Wolves were unaffected by other populations in Wyoming.
D
Wolves’ breeding season was affected by the drought.
7

Which describes a disruption in the water cycle that could affect photosynthesis?

A
Heat causes an excess of transpiration.
B
Heat causes an excess of evaporation.
C
Heat causes an excess of condensation.
D
Heat causes an excess of precipitation.
8

Which of the following could result in secondary succession?

A
the formation of a tall sand dune on a previously grassy beach
B
a vast glacier in motion forming a U-shaped valley in its wake
C
a volcanic eruption that covers most of what used to be a forest
D
an introduced species that destroys all the native plants in an area
9

Which answer gives both a positive impact and a negative impact associated with the effects of nitrogen- and phosphorus-enhanced fertilizers?

A
increased algal blooms and damage to drinking water
B
increased plant growth and damage to drinking water
C
increase in denitrifying bacteria and increase in plant growth
D
increase in a limiting resource and increase in denitrifying bacteria
10

A conservation biologist has determined the status of the ecosystems in a protected area, as shown in the table below. Based on the table, which part of the pie chart represents secondary succession?Status of ecosystemsPercentage of protected areaPrimary succession10Secondary succession30Barren land5Established community55

Question illustration
A
segment A
B
segment B
C
segment C
D
segment D
11

How does conservation affect biodiversity?

A
It helps to preserve climate change.
B
It decreases species diversity.
C
It helps to preserve biodiversity.
D
It decreases ecosystem diversity.
12

How could the loss of biodiversity affect humans?

A
It may cause an increase in the human population as competition is reduced.
B
It may lead to the loss of potential medicines, foods, and products.
C
It could lead to a decrease in infectious and other diseases that affect humans.
D
It could cause a decrease in the amount of pollutants on the planet.
13

If a deer eats grass, what percentage of energy will the deer acquire from the grass?

A
0.1 percent
B
1 percent
C
10 percent
D
100 percent
14

What is the primary source of energy for food chains in an ecosystem?

A
decomposers
B
producers
C
consumers
D
the sun
15

Which describes a disruption in the water cycle that could affect photosynthesis?

A
Heat causes an excess of transpiration.
B
Heat causes an excess of evaporation.
C
Heat causes an excess of condensation.
D
Heat causes an excess of precipitation.
16

What would happen to the size of the herbivore population if the producer population decreased?

A
decrease
B
double in number
C
stay the same
D
triple in number
17

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
18

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.
19

Based on the food chain below, if a bald eagle acquires 50 kg of energy, how much energy did the zooplankton get from the phytoplankton? phytoplankton zooplankton bivalves sea ducks bald eagle

Question illustration
A
500 kg
B
5,000 kg
C
50,000 kg
D
500,000 kg
20

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.

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