Bio 100 Exam 4


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  • Question 1

1.00000 out of 1.00000 points

A mass extinction is?
Answers: a.

global in scale

b.

responsible for the death of many different groups of organisms

c.

always caused by human activity

d.

a and b above are correct

  • Question 2

1.00000 out of 1.00000 points

A relatively small natural area with an exceptionally large number of species living in it, is a?
Answers: a.

biological impossibility

b.

biodiversity hotspot

c.

mass extinction

d.

viable population

  • Question 3

1.00000 out of 1.00000 points

Which of the following could help to reduce the level of carbon dioxide in the environment?
Answers: a.

plant more trees

b.

reduce our use of fossil fuels

c.

driving more fuel efficient cars

d.

all of the above

  • Question 4

1.00000 out of 1.00000 points

 How can the loss of any particular species have an economic impact on humans?
Answers: a.

they could be directly harvested for products

b.

they could contain potential genetic diversity for future breeding

c.

they could be useful as biological control agents

d.

all of the above could be true

  • Question 5

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 In human populations, a decrease in death rate is usually later followed by a decrease in birth rate, but the time lag between these two events is called?
Answers: a.

a demographic transition

b.

carrying capacity

c.

a population pyramid

d.

bad news for everyone!

  • Question 6

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The first species to live on new land, such as that formed from volcanic lava, are called …….?
Answers: a.

climax community

b.

keystone species

c.

foundation species

d.

pioneer species

  • Question 7

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A diagram showing a summary of the numbers and proportions of individuals of each sex and age group in a population or country is called ?
Answers: a.

a population pyramid

b.

demographic momentum

c.

net primary productivity

d.

a demographic transition

  • Question 8

1.00000 out of 1.00000 points

 What is demographic momentum?
Answers: a.

the time lag between when humans reduce birth rates and when population growth begins to slow

b.

the number of generations it takes for a population to reach zero population growth

c.

the time between the reduction in death rates and the reduction in birth rates

d.

the time when the world’s human population will reach 20 billion

  • Question 9

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Why is it bad if humans put more nutrients into the environment than are naturally there?
Answers: a.

they contribute to acid rain

b.

they contribute to global warming

c.

they contribute to eutrophication

d.

they do all of the above

  • Question 10

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A population that is growing exponentially increases?
Answers: a.

by the same number of individuals each generation

b.

by a constant proportion each generation

c.

in some years and decreases in others

d.

never

  • Question 11

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A group of interacting individuals of a single species located within a particular area is?
Answers: a.

a biosphere

b.

an ecosystem

c.

a population

d.

a community

  • Question 12

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Which of the following biomes is characterized by short growing seasons?
Answers: a.

deserts

b.

tropical wet forests

c.

Arctic tundra

d.

savanna

  • Question 13

1.00000 out of 1.00000 points

 What is estimated to be the current world human population growth rate?
Answers: a.

– 0.7 %

b.

+2.5 %

c.

+1.7 %

d.

+1.2 %

  • Question 14

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A forest fire is an example of ________________ regulation.
Answers: a.

density-dependent

b.

density-independent

c.

r-selected

d.

k-selected

  • Question 15

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What is it called when individuals in a population are evenly spaced in their habitat?
Answers: a.

clumped

b.

uniform

c.

random

d.

exponential

  • Question 16

1.00000 out of 1.00000 points

Which cause of extinction results from humans’ direct use of a species?
Answers: a.

overexploitation

b.

habitat fragmentation

c.

pollution

d.

global warming

  • Question 17

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 In the “Population Paradox” film, what single factor has been most responsible for Kenya’s population pyramid being turned upside down, with more old people surviving than the young?
Answers: a.

Civil war

b.

Famine

c.

Mass immigration

d.

HIV/AIDS

  • Question 18

1.00000 out of 1.00000 points

The number of currently described species on Earth is about………?
Answers: a.

1.5 million

b.

10 million

c.

150,000

d.

17,000

  • Question 19

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Another human-induced cause of extinction, like habitat loss, is?
Answers: a.

pollution

b.

overexploitation

c.

introduction of exotic species

d.

all of the above

  • Question 20

1.00000 out of 1.00000 points

 Bees being indispensable pollinators of many plants, including human crops, is a classic example of?
Answers: a.

a predator-prey relationship

b.

mutualism

c.

the competitive exclusion principle

d.

a keystone species

  • Question 21

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 An example of an invasive species that was recently introduced to the tiny Pacific island of Guam, and caused many local extinctions is?
Answers:  the domestic cat
 the bald eagle
 the polar bear
 

the brown tree snake

  • Question 22

1.00000 out of 1.00000 points

What is the human population of Earth projected to be in 2050, according to the UN?
Answers: a.

2050 million

b.

about 3 billion

c.

over 10 billion

d.

14 million

  • Question 23

1.00000 out of 1.00000 points

The majority of water found on Earth is:
Answers: a.

ice

b.

water vapor

c.

fresh water

d.

salt water

  • Question 24

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A species that has a large effect on a community relative to its abundance is called a
Answers: a.

predator

b.

herbivore

c.

keystone species

d.

dominant species

  • Question 25

1.00000 out of 1.00000 points

Which of the following is a density-dependent factor that can limit population growth?
Answers: a.

lack of suitable habitat

b.

pollutants

c.

pesticides

d.

weather fluctuations

  • Question 26

1.00000 out of 1.00000 points

Species that have many offspring at one time are usually:
Answers: a.

r-selected

b.

k-selected

c.

both r- and k-selected

d.

not selected

  • Question 27

0.00000 out of 1.00000 points

The growth of human populations over the past 150 years is primarily due to?
Answers: a.

increases in the death rate

b.

decreases in the birth rate

c.

decreases in the death rate

d.

increases in net primary productivity

  • Question 28

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What kind of ecosystem are exotic species especially threatening to?
Answers: a.

deserts

b.

marine ecosystems

c.

islands

d.

tropical forests

  • Question 29

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The maximum population size that can be supported indefinitely by an environment is the
Answers: a.

maximum increase

b.

carrying capacity

c.

exponential growth

d.

population balance

  • Question 30

1.00000 out of 1.00000 points

What amount of energy is transferred between trophic levels in a typical food chain?
Answers: a.

100%

b.

1%

c.

10%

d.

13%

  • Question 31

1.00000 out of 1.00000 points

Why is the tundra treeless?
Answers: a.

lack of sufficient water

b.

permanently frozen ground

c.

winters too harsh

d.

too many fires

  • Question 32

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 The study of the interaction among organisms and between organisms and their environment is defined as?
Answers: a.

ecology

b.

population biology

c.

demography

d.

climatology

  • Question 33

1.00000 out of 1.00000 points

Pollination is an example of…….?
Answers: a.

a possible source of new drugs

b.

chemical diversity

c.

an ecosystem service

d.

crop pest control

  • Question 34

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 What would be the best way to estimate human population size?
Answers: a.

mark and recapture studies

b.

count the number of houses and then extrapolate

c.

do a basic census

d.

do aerial photography and extrapolate

  • Question 35

1.00000 out of 1.00000 points

A key feature of estuaries is:
Answers: a.

low light conditions and high productivity

b.

salt water and fresh water

c.

frequent algal blooms

d.

little or no vegetation

  • Question 36

1.00000 out of 1.00000 points

What is nitrogen fixation?
Answers: a.

the process by which gaseous nitrogen in air is converted to a form that plants can use

b.

fixing the levels of nitrogen to the levels that we had in 1960

c.

the process by which nitrogen runs into water and kills fish

d.

none of the above

  • Question 37

0.00000 out of 1.00000 points

A population begins to grow slowly, then at a very rapid rate, and finally levels off at a stable number. This pattern is an example of?
Answers: a.

a tightly linked cycle

b.

a J-shaped or exponential population curve

c.

a population crash

d.

an S-shaped or logistic population curve

  • Question 38

1.00000 out of 1.00000 points

 The current population of the US is only about 5% of the world’s population, but as a society we consume approximately how much of the world’s resources?
Answers: a.

1%

b.

5%

c.

25%

d.

75%

  • Question 39

1.00000 out of 1.00000 points

Which of the following methods will provide the best information about both the size and density of a population?
Answers: a.

mark and recapture

b.

mark and release

c.

quadrat

d.

life table

  • Question 40

1.00000 out of 1.00000 points

 In the film “Population Paradox”, what country has been undergoing such negative population growth and a predominantly aging society, such that they soon will not have enough population to support their economy?
Answers: a.

Kenya

b.

Sweden

c.

Japan

d.

India

  • Question 41

1.00000 out of 1.00000 points

Which factor is associated with recent declines in some country’s population growth rate?
Answers: a.

an increase in women’s social status

b.

an increase in female educational level

c.

an increase in per capita income

d.

all the above

  • Question 42

1.00000 out of 1.00000 points

Which mass extinction is famous since it was responsible for the extinction of the dinosaurs?
Answers: a.

the terminal Devonian extinction

b.

the end of the Permian extinction

c.

the end of the Triassic extinction

d.

the Cretaceous-Tertiary (or K-T) boundary extinction

  • Question 43

1.00000 out of 1.00000 points

A symbiotic relationship where both of the co-existing species benefit from the interaction is called ……?
Answers: a.

commensalism

b.

parasitism

c.

mutualism

d.

communism

  • Question 44

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 Which of the following is considered a prime example of a keystone species in the Yellowstone National Park ecosystem in the US.
Answers: a.

the redwood tree

b.

the elk

c.

the beavers

d.

the wolf

  • Question 45

1.00000 out of 1.00000 points

Current rates of species extinction appear to be _______ historical (background) rates of extinction.
Answers: a.

equal to

b.

much greater than

c.

much less than

d.

just a little bit more than

  • Question 46

1.00000 out of 1.00000 points

According to some, the most effective way to reduce the current rate of extinction is to?
Answers: a.

preserve habitat, especially in highly diverse areas

b.

eliminate the risk of genetic drift

c.

focus on a single species at a time

d.

build more zoos

  • Question 47

1.00000 out of 1.00000 points

One of the major effects of an increase in atmospheric carbon dioxide is
Answers: a.

global warming

b.

a cooler than average climate

c.

an increase in acid rain

d.

a decrease in plants’ ability to photosynthesize

  • Question 48

1.00000 out of 1.00000 points

Species that are purposely or accidentally introduced to new geographic regions
Answers: a.

can become serious pests by killing the native species or reproducing very quickly

b.

usually quickly die out

c.

frequently form hybrids with native species

d.

experience increased mutation rates that help them adapt to the new ecosystem

  • Question 49

1.00000 out of 1.00000 points

 What is eutrophication?
Answers: a.

a complete lack of nutrients in rainforest soils

b.

excess nutrients, in the form of fertilizer, washing from soils into waterways and causing excessive algal or plant growth

c.

the process whereby large tracts of natural forest are fragmented into smaller pieces, impacting the wildlife in them

d.

the accumulation of nitrogen gas in the atmosphere causing global warming

  • Question 50

1.00000 out of 1.00000 points

Populations that rely on stored resources are likely to overshoot the carrying capacity of the environment and consequently experience a?
Answers: a.

demographic momentum

b.

decrease in death rates

c.

population crash

d.

exponential growth