Ecosystems
Unit 2: Population Balance
Post-Test
1.
A species is best defined as
A.
B.
C.
D.
E.
. (Objective 1; answer – B)
individuals that have the same parents
individuals that can breed to produce fertile offspring
groups of animals that are part of a food chain
groups of animals and plants that interact
animals that look like each other
2.
In a food web, the most important members are the
answer – E)
A.
B.
C.
D.
E.
3.
4.
plants
omnivores
carnivores
decomposers
all members are equally important
The number of individuals of the same species is known as
(Objective 1; answer – C)
A.
B.
C.
D.
E.
. (Objective 2;
.
an environment
a family
a population
a niche
an ecosystem
An ecosystem is best described as: (Objective 1; answer – D)
A.
B.
C.
D.
E.
the number of individuals living in an area.
all of the different species in the world
the number of individuals of the same species.
all of the individuals in a food chain.
all of the species that occupy the same level in a food web.
5.
In order for a population to survive, it needs to have
(Objective 2; answer – E)
A.
B.
C.
D.
E.
a very narrow range in the age of its members
only very young members
either very old or very young members
mainly middle aged to older members
a broad range of ages among it members
.
6.
Populations with high density are more resistant to
answer – A)
A.
B.
C.
D.
E.
. (Objective 2;
predators
disease
starvation
loss of resources
genetic mutation
7.
The most important resources for plant populations are
(Objective 2; answer – A)
A.
B.
C.
D.
E.
water and sunlight
soil and wind
birds and animals
changes in seasons and time
fertilizer and soil
8.
Whether a species survives or faces extinction is determined by
(Objective 2; answer – C)
A.
B.
C.
D.
E.
9.
.
man
chance
population balance
natural selection
its niche
If the number of deer in an area increases above normal, the number of
will also increase. (Objective 3; answer – C)
A.
B.
C.
D.
E.
10.
.
grasses
elk
coyotes
shrubs
flowering plants
Which of the following results is likely to occur if too many predators are present
in an ecosystem? (Objective 3; answer – C)
A.
B.
C.
D.
E.
Fields would lose all of their grasses due to overgrazing.
Offspring born to prey species would have very little food.
Predators would die out after they kill of the prey species.
Prey species would flourish with an abundance of food.
Predators would form new species
11.
It was noted in the module that salmon are changing their sex in certain areas of
the U.S. What area population balance does this upset? (Objective 3; answer – B)
A.
B.
C.
D.
E.
12.
predator/prey relationship
sex ratio
population density
age distribution
succession
If you wanted to know the number of catfish in your local lake, you catch some,
mark them, then let them go. After catching and marking 100 catfish, you release
them. Later, you catch 100 more. Of those, 2 are marked and from the original
group. About how many catfish are in your lake? (Objective 3; answer – E)
A.
B.
C.
D.
E.
1000
2000
3000
4000
5000