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WorksheetsCommunity Ecology II
Total questions: 15
Worksheet time: 15mins
Name
Class
Date
1.
The efficiency of energy transfer from a lower trophic level to the next highest level is roughly
a)
1%
b)
10%
c)
100%
d)
1000%
2.
In the energy pyramid here, how much of the energy in each level gets lost as heat or used by the organism for survival?
a)
80%
b)
90%
c)
10%
d)
20%
3.
What is a keystone species?
a)
A species that helps to hold an ecosystem together
b)
A species that lives in or around rocks
c)
Keys and stones have nothing to do with ecology
d)
A keystone isn't a living thing, it's just a stone
4.
An organism's _________ is defined as the environment in which it lives.
a)
habitat
b)
niche
c)
social structure
d)
ecosystem
5.
A collection of organisms that make up a community as well as all of the nonliving aspects of the environment.
a)
Population
b)
Community
c)
Habitat
d)
Ecosystem
6.
Use the diagram to answer the question.
The trout is a source of food for the human and the eagle. When there are more than one organism vying for the same source we call this____?
The trout is a source of food for the human and the eagle. When there are more than one organism vying for the same source we call this____?
a)
Population
b)
Resources
c)
Community
d)
Competition
7.
animals or plants that other parts of the ecosystem depend on
a)
prey
b)
pack
c)
keystone species
d)
predators
8.
Identify the process shown in this diagram.
a)
Extinction
b)
Toxin Accumulation
c)
Pollution
d)
Biomagnification
9.
The process when concentrations of a harmful substance increases in organisms at higher trophic levels in a food chain or food web.
a)
Biomagnification
b)
Predation
c)
Extinction
d)
Accumulation
10.
Using pesticides like DDT may cause
a)
healthier teeth
b)
Eutrophication in lakes
c)
no effect
d)
Biomagnification in a food chain
11.
True or False: Biomagnification means that animals at the bottom of the food chain have a higher concentration of PCBs.
a)
True.
b)
False.
12.
What is the danger in eating some fish from lakes or ocean?
a)
They may be invasive species.
b)
If abundant, they may lead to a crash in other species.
c)
If they are high on the food chain they may contain high levels of mercury or POP's like PCB's
d)
They may contain too many nutrients from fertilizers.
13.
What is it called when a persistent pollutant (like mercury or PCBs) builds up in the tissues of an organism as they continue to eat something that contains the pollutant
a)
Subsidence
b)
Biomagnification
c)
Tragedy of the commons
d)
Bioaccumulation
14.
When a pine tree grows real tall and blocks sunlight to another pine tree it is _______ competition.
a)
Interference
b)
Intraspecific
c)
Interspecific
d)
Exploitative
15.
type of symbiosis in which one organism benefits and the other is unaffected
a)
commensalism
b)
parasitism
c)
competition
d)
mutualism
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