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Ecology Unit Review

Total questions: 75

Worksheet time: 53mins

Name
Class
Date
1.
How do predator prey relationship affect a population?
a)
They are in competition with each other
b)
One will go extinct
c)
Predators have exponential growth
d)
Controls size of both populations
2.
An environmental factor such as predation, disease, and competition that depends on the number of members in a population per unit
a)
dispersion
b)
density- independent factor
c)
density- dependent factor
d)
population growth rate
3.
An environmental factor such as storms and extreme heat or cold that affects population regardless of their density
a)
density- dependent factor
b)
population density
c)
dispersion
d)
density- independent factor
4.
All the living and non-living in an area
a)
ecosystem
b)
carnivore
c)
niche
d)
population
5.
Living factors in an ecosystem
a)
abiotic factors
b)
species
c)
trophic level
d)
biotic factors
6.
Non-living factor that affects an ecosystem
a)
biotic factor
b)
abiotic factor
c)
food chain 
d)
biome
7.
relationship in which two species live closely together
a)
resource
b)
mutualism
c)
succession
d)
symbiosis
8.
Which of the following includes only biotic factors?
a)
ecosystem
b)
habitat
c)
biosphere
d)
population
9.
The largest population that a given environment can sustainably support is known as its ________.
a)
limiting capacity
b)
carrying capacity
c)
logistic limit
d)
biotic potential
10.
Which of the following is TRUE of predator/prey relationships?
a)
The amount of prey does not affect the number of predators.
b)
Herbivores are limited by the number of prey in an ecosystem.
c)
Humans are not considered predators.
d)
The number of predators is determined by available prey.
11.
Which symbols best describe mutualism?
a)
+,+
b)
+,-
c)
+,0
d)
-,0
12.
Red-billed oxpeckers are birds that often feed on parasites that infest impala.  This is an example of _______.
a)
commensalism
b)
mutualism
c)
neutralism
d)
competition
13.
When a mosquito bites you, you are the __________ and the mosquito is the  ____________.
a)
host, hostess
b)
parasite, host
c)
host, parasite
d)
prey, predator
14.
A relationship between two organisms in which both organisms benefit. 
a)
Mutualism 
b)
Competition
c)
Parasitsm 
d)
Commensalism 
15.
Which symbols best describe parasitism?
a)
+,+
b)
+,-
c)
+,0
d)
-,0
16.
A tapeworm and a cat have this type of relationship.
a)
mutualism
b)
parasitism
c)
commensalism
d)
competition
17.
A relationship between two organisms in which one organism benefits and the other is unharmed...
a)
Mutualism 
b)
Competition
c)
Parasitsm 
d)
Commensalism 
18.
How much energy is available to be passed on to the next trophic level in an ecosystem?
a)
100%
b)
10%
c)
50%
d)
75%
19.
What is a trophic level?
a)
Each level represented within a food chain or web.
b)
Levels of ecosystems that the world is divided into.
c)
Different levels of nutrients present within an organism.
d)
The levels of sunlight an autotroph needs to survive. 
20.
All energy on Earth ultimately comes from what source?
a)
Water
b)
Sun
c)
Consumers
d)
Oxygen
21.
Example of a decomposer
a)
fungus
b)
mouse
c)
plants
d)
frogs
22.

Abiotic and biotic factors in the environment

a)

ecosystem

b)

community

c)

niche

d)

population

23.

population growth decreases at carrying capacity

a)

logistic growth

b)

predator-prey

c)

exponential growth

d)

mutualism

24.

critical species in keeping ecosystem healthy

a)

population

b)

organism

c)

apex predator

d)

keystone species

25.

group of same species living together

a)

keystone species

b)

organisms

c)

population

d)

community

26.

increase of toxins in an individual

a)

bioaccumulation

b)

exponential growth

c)

parasitism

d)

biomagnification

27.

population growth without limits

a)

biomagnification

b)

biome

c)

logistic growth

d)

exponential growth

28.

maximum sustainable population

a)

exponential growth

b)

carrying capacity

c)

logistic growth

d)

extinction

29.

populations of different species

a)

biome

b)

ecosystem

c)

community

d)

niche

30.

role played in the community

a)

keystone species

b)

niche

c)

symbiosis

d)

competiton

31.

Which organisms are responsible for nitrogen fixation in the nitrogen cycle?

a)

Plants and animals

b)

Viruses and protists

c)

Fungi and algae

d)

Bacteria

32.

Based on the information in the diagram, which of the following processes returns carbon dioxide to the air or water? Choose all that apply

a)

decomposition of plants and animals

b)

combustion of coal and oil

c)

photosynthesis

d)

cellular respiration

33.

Which statement best describes how the carbon cycle and oxygen cycle are interrelated?

a)

Animals use CO₂ and release O₂ during respiration.

b)

Animals release H₂O during respiration and CO₂ during transpiration.

c)

Plants use CO₂ and release O₂ during photosynthesis.

d)

Plants release H₂O during transpiration and release CO₂ during photosynthesis.

34.

Match the following

a)

the movement of carbon through and between organisms and the physical environment

1.

carbon cycle

b)

the movement of water between the oceans, atmosphere, land, and living things

2.

water cycle

c)

the movement of nitrogen between the environment and living things

3.

nitrogen cycle

35.

Almost all nitrogen fixation occurs ​ (a)  

Choose from the below words
in the upper atmosphere
in the digestive track of animals
in outer space
in the soil
in plants
36.

All plants have nitrogen fixing bacteria in their roots.

a)

True

b)

False

37.

In the nitrogen cycle, what does label A in the diagram represent?

a)

Gas

b)

Clouds

c)

Carbon dioxide in the atmosphere

d)

Nitrogen in the atmosphere

38.

What do free living bacteria in the soil do?

a)

Make clouds

b)

Turn atmospheric nitrogen into nitrates

c)

Make carbon dioxide for plants to go through photosynthesis

d)

Help plants take in water

39.

Bacteria create a form of nitrogen that animals can use directly.

a)

True

b)

False

40.

Bacteria fix nitrogen from the atmosphere into a form plants can use.

a)

True

b)

False

41.

According to this diagram, animals get proteins from eating ________________________

a)

decomposers

b)

bacteria

c)

plants

d)

sunlight

42.

According to this diagram, plants absorb

a)

nitrates

b)

nitrogen fixing bacteria

c)

animals

d)

decomposers

43.

Plants and animals cannot use nitrogen directly from the air.

a)

True

b)

False

44.

What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?

a)

Assimilation

b)

Fixation

c)

Ammonification

d)

Denitrification

45.

What is the formula for atmospheric nitrogen?

a)

N

b)

N2

c)

NH3

d)

NO3

46.

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

a)

nitrogen composition

b)

nitrogen fixation

c)

ammonia

d)

denitrification

47.

How do animals get the nitrogen they need?

a)

From the air they breathe

b)

From the water they drink

c)

From the food they eat

d)

From the sun

48.

How is nitrogen "fixed" into a usable form for plants?

a)

Through action of bacteria only

b)

Through lightning only

c)

Through action of bacteria and lightning

d)

Through photosynthesis

49.

How is nitrogen "fixed" into a usable form for plants?

a)

Through action of bacteria only

b)

Through lightning only

c)

Through action of bacteria and lightning

d)

Through photosynthesis

50.

The process in which nitrogen circulates and is recycled is called

a)

The nitrogen cycle

b)

The carbon cycle

c)

The water cycle

d)

The phosphorus cycle

51.

What converts nitrogen gas into a usable form for plants and animals?

a)

bacteria

b)

rain

c)

fungi

d)

car exhaust

52.
Combustion is another word for __________.
a)
Transportation
b)
Respiration
c)
Fossil Fuels
d)
Burning
53.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
54.

The depletion in the Ozone layer is caused by:

a)

Carbon dioxide

b)

Nitrous oxide

c)

Methane

d)

Chlorofluorocarbon

55.
Increased industrialization will most likely
a)
decrease available habitats 
b)
increase environmental carrying capacity 
c)
increase the stability of ecosystems 
d)
decrease global warming
56.

BIOdiversity means a variety of . . .

a)

People

b)

Plants

c)

Life

d)

Places

57.
The living portions of the ecosystem.
a)
Biotic factors
b)
Abiotic factors
58.
The nonliving aspects of an ecosystem.
a)
Abiotic factors
b)
Biotic factors
59.

spatial distribution of individual within the population

a)

Geographic Distribution

b)

Population Density

c)

Dispersion

d)

Growth Rate

e)

Age Structure

60.
What type of growth is this graph representing?
a)
Logistic Growth
b)
Exponential Growth
61.
What type of growth is this graph representing?
a)
Logistic Growth
b)
Exponential Growth
62.
A group of organisms of the same species living in the same place at the same time is called a(n) _________.
a)
Ecosystem
b)
Population
c)
Community
d)
Organism
63.
The largest number of individuals of a population that the environment can support is known as...
a)
Carrying capacity
b)
Maximum population
c)
Primary succession
d)
Secondary succession
64.
In the graph to the right, what is the population of deer at the carrying capacity of the environment?
a)
3
b)
7
c)
40
d)
70
65.
What is the carrying capacity of the following graph?
a)
1000
b)
800
c)
8000
d)
600
66.
What is the carrying capacity of the graph?
a)
around 500
b)
less than 500
c)
more than 500
d)
around 600
67.

The carrying capacity of a region is affected by both density-dependent and density independent factors. Organize these options into the right categories

Categorize the following

food

shelter

disease

rainfall

temperature

pollution

density dependent factor
density independent factor
68.

Decide if each of the following limiting factors are density-dependent or density-independent.

Categorize the following

Many fish die due to a drastic change in water temperature.

Due to severe overcrowding in an Asian village, many children do not survive to adulthood.

An extensive drought in the plains threatens wildebeest, giraffe, and springbok populations

Since snakes prey on frogs, an increase in the frog pop. causes an increase in the snake pop.

Density-dependent
Density-independent
69.

Which best describes the graph of logistic growth?

a)
S-shaped
b)
J-shaped
c)
W-shaped
d)
U-shaped
70.

What type of growth is represented in this graph?

a)
exponential
b)

logistic

c)

survivorship curve

d)

predator-prey

71.

Which of the following are density independent factor(s)?

a)

competition for resources

b)

predator-prey relationships

c)

parasitism and disease

d)

weather, natural disaster and man made disturbances

72.

Processes that remove individuals from a population.

a)

death and emigration

b)

birth and immigration

73.
Under ideal conditions with unlimited resources, a population will have ________.
a)
linguistic growth
b)
experimental growth
c)
exponential growth
d)
logistic growth
74.
Emigration is the movement of individuals ______ a population.
a)
into
b)
out of
75.
The average number of individuals per unit of area or volume is called ______.
a)
Population size
b)
Population systematics
c)
Population density
d)
Population distribution

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