Download Name: Date: ______ Class

Name: _________________________
Date: ______ Class: ____ Seat# ____
Multiple Choice Identify the choice that best completes the statement or answers the question (2 points each)
1.
2.
3.
4.
Consumers that eat both plants and animals are called
A. omnivores
B. herbivores
C. carnivores
D. scavengers
If a snake eats a mouse that eats grass, the snake is a
A. producer.
B. secondary consumer.
C. primary consumer.
D. decomposer.
The many overlapping food chains in an ecosystem make up a(n)
A. food web.
B. niche.
C. energy pyramid.
D. feeding level.
The step in the water cycle in which water vapor becomes liquid water is
A. condensation.
B. nitrogen fixation.
C. recycling.
D. precipitation.
5.
In which process do producers use carbon from carbon dioxide to produce other carbon-containing
molecules?
A. the nitrogen cycle.
B. photosynthesis.
C. precipitation.
D. the water cycle.
6.
A group of land ecosystems with similar climates and organisms is called a(n)
A. energy pyramid.
B. climate.
C. biome.
D. food web.
An organism that can make its own food is called a
A. consumer.
B. decomposer.
D. scavenger.
7.
8.
9.
C. producer.
Vultures, which feed on the bodies of dead organisms, are
A. primary consumers.
B. scavengers.
C. producers.
D. herbivores.
The first organism in a food chain is always a
A. consumer.
B. herbivore.
C. carnivore.
D. producer.
C. oxygen.
D. carbon dioxide.
10. What do producers release as a result of photosynthesis?
A. hydrogen.
B. nitrogen.
11. Which of the following is a biotic factor in the prairie ecosystem?
A. water
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B. sunlight
C. soil
D. grass
12. Organisms that serve to return matter such as nitrogen and other raw materials are called
A. scavengers.
B. parasites.
C. quaternary consumers.
D. decomposers
13. The smallest unit of ecological organization is a single
A. population.
B. community.
C. organism.
D. ecosystem.
14. Which of the following is an example of a population?
A. the cats and dogs in your neighborhood
C. the rocks in a rock collection
B. the bushes and grass in a park
D. the gray wolves in a forest
15.Counting the number of organisms in a small area and multiplying to estimate the number in a larger area is
called
A. direct observation.
B. mark and recapture.
C. population density.
D. sampling.
16. A group of antelope leaving the herd in search of better grassland is an example of
A. immigration.
B. emigration.
C. increasing birth rate.
D. decreasing death rate.
17.The largest population that an environment can support is called its
A. carrying capacity.
B. limiting factor.
C. birth rate.
D. death rate.
18.An organism’s particular role in its habitat, or how it makes its living, is called its
A. carrying capacity.
B. ecosystem.
C. competition.
D. niche.
19.The process of changing free nitrogen into a useable form of nitrogen is called
A. neutralization.
B. nitrogen fixation.
C. dispersal.
D. adaptation.
20.In a habitat, two species having the same niche would bring about
A. competition.
B. predation.
C. symbiosis.
D. parasitism.
21.When a jellyfish paralyzes a tiny fish with its poisonous tentacles, the fish is the
A. predator.
B. prey.
C. host.
D. parasite.
22.A close relationship between two species that benefits at least one of the species is called
A. natural selection.
B. symbiosis.
C. adaptation.
D. competition.
23.The Escherichia coli bacteria in your large intestines make vitamins B1, B2, and K by taking in food you did
not digest. This is an example of which type of interaction?
A. competition
B. mutualism
C. parasitism
D. commensalism
24.An early winter frost preventing further growth in an orange grove is an example of
A. carrying capacity.
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B. a limiting factor.
C. a biotic factor
D. indirect observation.
25.Water, sunlight, and soil are examples of factors in an ecosystem that are
A. renewable.
B. non renewable.
C. biotic.
D. abiotic.
26.Squirrels, bears, bunnies, and tree frogs living in the same forest represent a(n)
A. population.
B. community.
C. species.
D. ecosystem.
27.Studying the effects of damming a river on the organisms that live there would be done by a(n)
A. ecologist.
B. marine biologist.
C. zoologist.
D. river expert.
28.When a flea is living on a dog, the dog is the
A. parasite.
B. host.
C. predator.
D. prey.
29.Population density is defined as
A. an approximation of a number, based on reasonable assumptions.
B. the number of individuals of a population in a specific area.
C. the number of individuals moving into a population.
D. the smallest level of ecological organization.
30.A hawk building its nest on an arm of a saguaro cactus is an example of
A. commensalism.
B. mutualism.
C. parasitism.
D. predation.
31.Which of the following is not a density –independent limiting factor for population?
A. human activities
B. natural disasters
C. tides
D. fires
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the
statement true. (2 points each)
32. A habitat meets most of the needs of the organisms that live in it. __________________
33. Density- dependent limiting factors usually affect only small populations. __________________
34. All of the members of a community belong to the same species. __________________
35. An organism that eats only plants is a secondary consumer. __________________
36. All the biotic and abiotic factors in an area together make up a community. __________________
37. A food web can connect a terrestrial and an aquatic ecosystem. __________________
38. Both species benefit in the type of symbiosis called commensalism. __________________
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Diagram (16 points total)
First, label the pyramid levels (producers, primary consumers…). Next, using the food web on the left, put
the hawk, snake, shrew, frog, marsh grass, grasshopper, cricket, and cattail into the food pyramid to the
right.
quaternary
consumers
hawk
tertiary
consumers
snake
secondary
consumers
frog
hawk
primary
consumers
shrew
snake
shrew
grasshopper
frog
cricket
producers
marsh grass
grasshopper cricket
cattail
marsh grass
cattail
Short response (6points each)
If the snake required 150 Kcal of energy, what is the minimum amount of energy that would have to be
stored in the producers? Explain your answer.
If a disease came along that reduced the frog population what would be the effect on the rest of the
organisms in the food web?
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