Ecosystems Test Review Fall 2014 (Part 3 Of 3): Question Preview (ID: 20921)

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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) The gazelle birth rate would also increase.
c) Gazelles would not be affected.
d) The gazelle death rate would increase.

What type of organism is at the basis of all food chains?
a) consumer
b) producer
c) herbivore
d) carnivore

What is detritus?
a) decaying bits of animal and plant matter
b) microscopic animals eaten by filter feeders
c) the energy source for carnivores
d) the abiotic factors in an ecosystem

Which of the following is an example of commensalism?
a) A bird infects a tree with a disease.
b) A bird builds a nest in a tree.
c) A bird burrows into a tree, cutting off its water supply.
d) A bird feeds off a tree's nutrients.

If the primary consumers in a food chain become extinct, what will most likely happen?
a) The secondary consumers will also die out.
b) The producer population will die out.
c) The secondary consumers will become tertiary consumers.
d) The secondary consumers will start eating decomposers.

What is true about parastic relationships?
a) In general, parasites only weaken, not kill, their hosts.
b) In general, parasitism is rarely found in nature.
c) In general, parasites receive only a small portion of nutrients from their hosts.
d) In general, hosts are much smaller than their parasites.

If two species in an ecosystem both feed on leaf beetles, then these two species are
a) mutualists
b) parasites
c) competitors
d) prey

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) A predator hunts its prey; a parasite does not.
d) Parasites are microscopic organisms; predators are not.

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 have strong swimming muscles.
b) The salmon lay their eggs in freshwater.
c) The salmon grow rapidly after hatching.
d) The salmon are able to withstand drastic changes in salinity.

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

An animal that eats only plants is a(n)
a) carnivore
b) herbivore
c) omnivore
d) detritivore

What species interaction involves one organism serving as a host to the other organism?
a) predation
b) parasitism
c) commensalism
d) mutualism

Which type of aquatic environment covers 75 percent of Earth's surface?
a) wetland
b) estuarine
c) freshwater
d) marine

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.

Tiger sharks could be considered a keystone species because they
a) keep turtle populations under control, which protects sea grasses
b) are able to adapt to most types of marine ecosystems
c) have little impact on other aquatic populations
d) are at the highest trophic level of a food pyramid

Why are omnivores classified as secondary consumers?
a) because they eat only plants
b) because they obtain energy directly from producers
c) because they eat plants and animals
d) because their only source of energy is other consumers

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 help the trees adapt to their feeding behaviors.
b) The exotic insects will not be able to compete with the native insects.
c) The exotic insects will not have an effect on the forest ecosystem.
d) The trees will begin to die off as the exotic insects begin to feed on them.

How does a primary consumer differ from other consumers?
a) Primary consumers eat only insects.
b) Primary consumers eat only producers.
c) Primary consumers eat plants and animals.
d) Primary consumers eat other consumers and bacteria.

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

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