2. A group of organisms of different species living together in a particular place is called
a community
a population
a biome
a habitat

3. An organism's niche includes
what it eats
where it eats
when it eats
all of the above

4. If the niches of two organisms overlap,
the organisms may have to compete directly.
the two organisms will always form a symbiotic relationship.
both organisms will disappear from the habitat.
one organism usually migrates to a new habitat.

5. Which of the following does not represent a population?
all the robins in Austin, Texas
all the grass frogs in the pond of Central Park, New York City
all the birds in Chicago, Illinois
all the earthworms in Yosemite National Park

6. Trees growing along the banks of a river but not growing in the surrounding area would best be described as a ______ dispersion of the trees.
clumped
even
random
mixture of clumped, even, and random

7. Which of the following is a density-independent regulatory factor?
food
water
temperature
number of nesting sites

8. A tick feeding on a human is an example of
parasitism
mutualism
competition
predation

9. The relationship between plants and the bees that pollinate them is an example of
commensalism
competition
mutualism
parasitism

10. commensalism:one organism::
parasitism:both organisms
predation:neither organism
mutualism:one organism
mutualism:both organisms

11. Generally, the closer an area is to the equator, the greater the diversity in species. Following are the latitudes of four cities. Which city would you predict to have the greatest diversity of species?
Berlin, Germany (52 degrees 32' North latitude)
Montreal, Canada (45 degrees 0' North latitude
Denver, Colorado (39 degrees 44' North latitude)
Brisbane, Australia (27 degrees 30' South latitude)

12. Organisms that manufacture organic nutrients for an ecosystem are called
primary consumers
predators
primary producers
scavengers

13. Cows:herbivores::
horses:carnivores
plants:producers
algae:consumers
caterpillars:producers

14. When an organism dies, the nitrogen in its body
can never be reused by other living things.
is immediately released into the atmosphere.
is released by the action of decomposers
None of the above

15. Animals that feed on plants are at least in the
first trophic level.
second trophic level.
third trophic level
fourth trophic level

16. In going from one trophic level to the next higher level,
the number of organisms increases.
the amount of usable energy increases.
the amount of usable energy decreases.
diversity of organisms increases

17. Coal, oil, and natural gas
are formed from decayed plants.
are fossil fuels.
release carbon dioxide when they are burned.
All of the above

18. Plankton are
a major formation ingredient of most fossil fuels.
found in the deep-water zone of most lakes and oceans.
the base of most aquatic food webs.
Usually in the third and fourth trophic levels of ocean ecosystems

19. A relationship between a producer and consumer is best illustrated by
a snake eating a bird.
a fox eating a mouse.
a lion eating a zebra.
a zebra eating grass.

20. A population of organisms grows
with no natural restrictions except the availability of food
when the birth rate exceeds the death rate.
only in the absence of predators or natural diseases.
All of the above

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