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Ecology 1: Populations, Communities, Ecosystems
Test Description: Use your knowledge of Living Environment to answer all questions in the data set. You may need a calculator to answer some of the questions. Good Luck.
Instructions: Answer all questions to get your test result.
1) Which diagram best illustrates the relationship between humans (H) and ecosystems (E)?
A
1
B
4
C
3
D
2
2) One biotic factor that affects consumers in an ocean ecosystem is
A
pH of water
B
number of autotrophs
C
salt content
D
temperature variation
3) One biotic factor that limits the carrying capacity of any habitat is the
A
level of atmospheric oxygen
B
availability of water
C
activity of decomposers
D
amount of soil erosion
4) Abiotic factors that characterize a forest ecosystem include
A
pH and number of heterotrophs
B
temperature and amount of available water
C
light and biodiversity
D
types of producers and decomposers
5) In an ocean, the growth and survival of seaweed, small fish, and sharks depends on abiotic factors such as
A
number of herbivores, carbon, and food
B
number of decomposers, carbon dioxide, and nitrogen
C
sunlight, temperature, and minerals
D
sunlight, pH, and type of seaweed
Helpful Hint
The table below contains information about glucose production in a species of plant that lives in the water of a salt marsh.
6) Which of the following terms describe temperature in the investigation shown?
A
biotic factor and dependent variable
B
biotic factor and independent variable
C
abiotic factor and dependent variable
D
abiotic factor and independent variable
Helpful Hint
The table below contains information about glucose production in a species of plant that lives in the water of a salt marsh.
7) Based on the data provided, at which temperature would the plants most likely use the greatest amount of carbon dioxide?
A
10° C
B
30° C
C
40° C
D
20° C
Helpful Hint
The table below contains information about glucose production in a species of plant that lives in the water of a salt marsh.
8) Based on the data shown, how much oxygen will plants that live in water at 10° C most likely produce?
A
the most oxygen produced at any temperature
B
twice the amount of oxygen produced at 20° C
C
more oxygen than is produced at 30° C
D
the same amount of oxygen produced at 40° C
9) The reason that organisms can not produce populations of unlimited size is that
A
species rarely compete with one another
B
there is no carrying capacity on Earth
C
interactions between organisms are unchanging
D
the resources of Earth are finite
10) What impact do the amounts of available energy, water, and oxygen have on an ecosystem?
A
They control environmental temperature.
B
They are used as nutrients.
C
They act as limiting factors.
D
They recycle the residue of dead organisms.
Helpful Hint
The desert is arid, with less than 25 cm of rain per year. The plants are spaced far apart, or are grouped around water sources. Most of the animals are active at night.
11) Which information concerning a desert is provided by the quotation below?
A
daily temperature range and types of autotrophs
B
time of rainy season and type of food used by heterotrophs
C
type of nutrition in animals and distribution of autotrophs
D
identity of a limiting factor and behavior of heterotrophs
Helpful Hint
Four environmental factors are listed below. A. energy; B. water; C. oxygen; D. minerals
12) Which factors limit environmental carrying capacity in a land ecosystem?
A
A, only
B
A, B, C, and D
C
A, C, and D, only
D
B, C, and D, only
Helpful Hint
The growth of a population is shown in the graph below.
13) Which letter indicates the carrying capacity of the environment for this population?
A
A
B
B
C
C
D
D
14) Ten breeding pairs of rabbits are introduced onto an island with no natural predators and a good supply of water and food. What will most likely happen to the rabbit population?
A
It will remain relatively constant due to equal birth and death rates.
B
It will decrease and then increase indefinitely.
C
It will increase until it exceeds carrying capacity.
D
It will die out due to an increase in the mutation rate.
15) After a rabbit population reaches the carrying capacity of its habitat, the population of rabbits will most likely
A
remain unchanged
B
decrease, only
C
increase, only
D
alternately increase and decrease
16) The size of a frog population in a pond remains fairly constant over a period of several years because of
A
the depth of water
B
decreasing competition
C
environmental carrying capacity
D
excessive dissolved oxygen
Helpful Hint
The graph below represents the growth of a population of flies in a jar.
17) Which letter indicates the part of the graph that represents the carrying capacity of the environment in the jar?
A
B
B
C
C
A
D
D
18) On which day did the population represented in the graph below reach the carrying capacity of the ecosystem?
A
day 5
B
day 8
C
day 3
D
day 11
19) The size of a mouse population in a natural ecosystem tends to remain relatively constant due to
A
the lack of natural predators
B
the carrying capacity of the environment
C
increased numbers of decomposers
D
cycling of energy
Helpful Hint
The graph below indicates the size of a fish population over a period of time.
20) The section of the graph labeled A represents
A
a population becoming extinct
B
biodiversity within the species
C
a population at equilibrium
D
nutritional relationships of the species
*select an answer for all questions
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