Name: _________________________________________ Date: __________________ Pd:_____
Keystone Review: Quiz 5
Directions: Choose the best choice to answer the following questions.
1.) A student’s wrote the following observations in a field notebook. Which term best
classifies all of the student’s observations?





a.
b.
c.
d.
Two grey wolves
Five moose
Several species of conifer trees
Large granite rock
Shallow pond
Population
Food chain
Ecosystem
Community
2.) A researcher observing an ecosystem describes the amount of sunlight, precipitation,
and type of soil present. Which factors is the researcher most likely describing
a. Biotic factors in a forest
b. Biotic factors in a tundra
c. Abiotic factors in a prairie
d. Abiotic factors in an ocean
3.) Which sequence correctly describes the flow of energy between organisms in the
marine food web below?
a.
b.
c.
d.
From seal to penguin to krill
From whales to krill to small fish
From sea birds to seals to penguins
From small fish to penguins to seals
4.) A species of snapping turtles has a tongue that resembles a worm. The tongue is used
to attract small fish to feed on. Which best describes the interaction between the fish
and the snapping turtle?
a. Predation
b. Symbiosis
c. Parasitism
d. Competition
5.) Which statement correctly describes how nitrogen in the soil returns to the
atmosphere?
a. Soil bacteria convert nitrates into nitrogen gas
b. Decomposers directly convert ammonium into nitrogen gas
c. Plants assimilate nitrites and convert them into nitrogen gas
d. Nitrogen-fixing bacteria in plant roots convert nitrates into nitrogen gas
6.) Agricultural runoff can carry fertilizers into lakes and streams. The runoff can cause
algae populations to greatly increase. Which effect does this change in algae population
sizes most likely have on affected lakes and streams?
a. An increase in water level
b. An increase in water clarity
c. A reduction in dissolved oxygen needed by fish and shellfish
d. A reduction in temperature variations near the water’s surface
7.) A farmer observed that an increase in a field’s soil nitrogen content was followed by an
increase in producer productivity. What does this observation most likely indicate
about the relationship between nitrogen and the producers in the field?
a. Nitrogen was a biotic factor
b. Nitrogen was a limiting factor
c. Nitrogen became a surplus resource
d. Nitrogen became a selection pressure
8.) A group of students measured a ten-square-meter section of a pond ecosystem and
recorded observations. Which statement is a testable hypothesis?
Quantitative
37 fish and 3 frogs
2 types of aquatic grasses
12 small rocks and 1 medium rock
sand
a.
b.
c.
d.
Qualitative
Leaves lie on the bottom of the pond
Water insects move along the water
surface
All 3 frogs are sitting on the pond bank
The frogs living in the pond represent a population
Water is an abiotic component in the pond ecosystem
If the fish are given more food, then they will be happier
If the frogs are startled they will jump into the water
9.) Scientists observed that the populations of top-level consumers in a particular
ecosystem were rapidly decreasing. Further studies revealed that there was also a
decline in producer productivity. Which other changes did the scientists most likely
observe in the ecosystem?
a. Increased producer diversity
b. Decreased population size at all levels
c. Decreased primary consumer populations only
d. Increased primary and secondary consumer diversity
10.)
Only 10 percent of the energy stored in an organism can be passed on to the
next trophic level. Of the remaining energy, some is used for the organism’s life
processes, and the rest is:
a. Used in reproduction
b. Stored in body tissue
c. Stored as fat
d. Eliminated as heat
11.)
What would happen if the population of the bird species shown in the ecosystem
were to suddenly decrease?
a.
b.
c.
d.
The grasshopper population would increase
The fish population would increase
The fish would occupy the birds niche
The fish and grasshoppers would compete for resources
12.)
a.
b.
c.
d.
13.)
a.
b.
c.
d.
How is parasitism different from commensalism?
Both organisms benefit in parasitism and only one organism benefits in
commensalism.
One organism benefits in parasitism and no organisms benefit in commensalism.
One organism is harmed in parasitism and both organisms are harmed in
commensalism.
One organism is harmed in parasitism and no organisms are harmed in
commensalism.
Which is a factor that could interrupt the progress of succession?
colonization of surfaces by lichens
different animals appearing at each stage
another natural disturbance
long-term fluctuations in climate
14.)
A tropical rain forest may be unable to be returned to its original climax
community after which of the following disturbances?
a. Forest fire
b. Clear cutting and farming
c. Flood
d. Hurricane
15.)
If a state wildlife agency were to introduce fissures into a region and as a result
there was a sharp decline in rabbit population due to the fisher population the fishers
would be a __________________ for the rabbit population due to
___________________.
a. Nutrient, predation
b. Limiting factor, predation
c. Resource, herbivory
d. Food, herbivory
16.)
a.
b.
c.
d.
A wolf pack hunts, kills, and feeds on a moose. In this interaction, the wolves are
Hosts
Prey
Mutualists
Predators
17.)
Why can’t the producers in some ecosystems make an unlimited supply of
organic material?
a. Temperatures are too hot for photosynthesis.
b. Too many carnivores eat the producers.
c. Energy needed to make organic material is lost as heat.
d. One or more nutrients are in short supply.
Use the following diagram and information to answer the following questions.
Isle Royale is located in Lake Superior. Isle Royale is home to populations of wolves and
moose. The interactions between the wolves and moose, as well as the individual population
sizes, have been studied since 1958. The graph shows the population sizes over time for both
wolves and moose.
18.)
Describe one limiting factor for the moose population.
The wolf population limits the ability of the moose population to grow.
19.)
Explain one likely reason why the wolf population rapidly increased between
1975 and 1980.
It was in response to the rapid increase in the population of the moose between 1970 and
1975.
20.)
Predict what will happen to the moose population’s size after 1994 by describing
the shape of the curve. In your answer, be sure to explain the reasoning behind the
prediction.
If the wolf population continues to decline the moose population will continue to increase.