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Ecosystems Test Review Fall 2014 (Part 3 Of 3)
Test Description: Life Science DE Ecosystems Review
Instructions: Answer all questions to get your test result.
1) How does a primary consumer differ from other consumers?
A
Primary consumers eat other consumers and bacteria.
B
Primary consumers eat plants and animals.
C
Primary consumers eat only insects.
D
Primary consumers eat only producers.
2) Humans are considered omnivores because
A
they obtain energy from producers and consumers
B
they eat only plants
C
they eat only animals
D
they are both secondary and tertiary consumers
3) An exotic insect is introduced to a forest ecosystem. It is resistant to the toxins the trees produce to protect them from being eaten by insects. How would this most likely affect the forest ecosystem?
A
The exotic insects will not have an effect on the forest ecosystem.
B
The exotic insects will not be able to compete with the native insects.
C
The exotic insects will help the trees adapt to their feeding behaviors.
D
The trees will begin to die off as the exotic insects begin to feed on them.
4) Tiger sharks could be considered a keystone species because they
A
are able to adapt to most types of marine ecosystems
B
have little impact on other aquatic populations
C
keep turtle populations under control, which protects sea grasses
D
are at the highest trophic level of a food pyramid
5) Why are omnivores classified as secondary consumers?
A
because they eat only plants
B
because they obtain energy directly from producers
C
because their only source of energy is other consumers
D
because they eat plants and animals
6) Which type of aquatic environment covers 75 percent of Earth's surface?
A
marine
B
freshwater
C
wetland
D
estuarine
7) Barnacles are often found attached to a whale's skin, causing no harm to the whale. If the barnacle and whale are commensalists, which of these best describes the barnacle?
A
The barnacle is neither harmed nor benefitted by its attachment to the whale.
B
The barnacle provides a food source for the whale.
C
The barnacle benefits from its attachment to the whale.
D
The barnacle acts as a host for the parasitic whale.
8) What type of ecosystem would be most directly affected by a natural disaster that changed the amount of salt in the ecosystem?
A
aquatic
B
desert
C
arctic
D
rainforest
9) An animal that eats only plants is a(n)
A
carnivore
B
detritivore
C
herbivore
D
omnivore
10) What species interaction involves one organism serving as a host to the other organism?
A
commensalism
B
parasitism
C
mutualism
D
predation
11) Salmon are born in freshwater, migrate to the ocean, and eventually return to freshwater to mate and die. What characteristic allows the salmon to survive this lifestyle?
A
The salmon lay their eggs in freshwater.
B
The salmon are able to withstand drastic changes in salinity.
C
The salmon grow rapidly after hatching.
D
The salmon have strong swimming muscles.
12) What is true about parastic relationships?
A
In general, parasites receive only a small portion of nutrients from their hosts.
B
In general, parasites only weaken, not kill, their hosts.
C
In general, hosts are much smaller than their parasites.
D
In general, parasitism is rarely found in nature.
13) If two species in an ecosystem both feed on leaf beetles, then these two species are
A
competitors
B
mutualists
C
parasites
D
prey
14) How does a predator differ from a parasite?
A
A parasite kills its host; a predator does not.
B
A predator benefits from its prey; a parasite does not benefit from its host.
C
Parasites are microscopic organisms; predators are not.
D
A predator hunts its prey; a parasite does not.
15) Which of the following is an example of commensalism?
A
A bird builds a nest in a tree.
B
A bird infects a tree with a disease.
C
A bird feeds off a tree's nutrients.
D
A bird burrows into a tree, cutting off its water supply.
16) If the primary consumers in a food chain become extinct, what will most likely happen?
A
The producer population will die out.
B
The secondary consumers will become tertiary consumers.
C
The secondary consumers will start eating decomposers.
D
The secondary consumers will also die out.
17) What type of organism is at the basis of all food chains?
A
carnivore
B
producer
C
herbivore
D
consumer
18) What is detritus?
A
the abiotic factors in an ecosystem
B
microscopic animals eaten by filter feeders
C
decaying bits of animal and plant matter
D
the energy source for carnivores
19) In parts of Africa, gazelles and lions are part of the same community. Gazelles are a food source for lions. How would an increase in lion birth rate most likely affect the gazelles?
A
The gazelle population would increase.
B
Gazelles would not be affected.
C
The gazelle birth rate would also increase.
D
The gazelle death rate would increase.
*select an answer for all questions
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