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Dynamic Ecosystems
Test Description: 7th grade
Instructions: Answer all questions to get your test result.
1) The living and nonliving things in an area make up the
A
ecosystem
B
population
C
community
D
species
2) All the organisms of the same species that live in the same area at the same time
A
ecosystem
B
population
C
community
D
species
3) The potential growth of a population if it could grow in perfect conditions with no limiting factors
A
overpopulation
B
biotic potential
C
climax community
D
carrying capacity
4) A tick attaches itself to a person and drinks its blood. It passes on Lyme disease to the person. This is an example of
A
commensalism
B
predator-prey relationship
C
parasitism
D
competition
5) ___ are formed when organisms of the same species work together for a common purpose
A
cooperative relationships
B
mutualistic relationships
C
commensalistic relationships
D
predator-prey relationshipa
6) Usually, changes to ecosystems happen
A
gradually
B
never
C
suddenly
D
quickly
7) Which of the following is first to grow during succession?
A
rocks
B
small plants
C
trees
D
shrubs and bushes
8) Ecological succession in new areas of land with little or no soil or vegetation.
A
secondary succession
B
dynamic succession
C
primary succession
D
volcano succession
9) What helps to fill the bottom of a pond?
A
decaying organisms
B
both
C
runoff containing dirt
10) What can happen if too much sediment enters a body of water
A
block sunlight for aquatic plants
B
habitat loss
C
all of the above
D
make it difficult to see
11) How are nutrients added to water?
A
both
B
runoff that includes fertilizers
C
decaying organisms
12) Humans can contribute to eutrophication
A
false
B
true
13) Any activity that takes resources from nature is called
A
competition
B
dynamic equilibrium
C
resource extraction
D
commensalism
14) Cropland that has been left alone will go through
A
dynamic succession
B
climax succession
C
primary succession
D
secondary succession
15) A close, long-term relationship between two species that usually involves an exchange of food or energy
A
dynamic equilibrium
B
cooperative relationship
C
symbiosis
D
competition
16) If an organism has decreased in numbers but isn't close to being extinct, it is considered
A
endangered
B
critically endangered
C
threatened
D
non-native
17) How is a predator-prey relationship beneficial to the prey?
A
the prey get exercise running from the predators
B
the predator will leave the prey alone once it eats a few
C
all of the above
D
more resources are available when the predators eliminate weak or injured prey.
18) Any material broken down by the process of weathering and then transported to a different place
A
hosts
B
prey
C
sediment
D
dirt
19) A symbiotic relationship that benefits one species but doesn't harm or benefit the other
A
parasitism
B
mutualism
C
communism
D
commensalism
20) Ravens like to eat the meat that wolves kill. The wolves scare the ravens away when they try to eat. This is
A
commensalism
B
predator-prey relationship
C
cooperative relationship
D
competition
*select an answer for all questions
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