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ECOLOGY UNIT PRACTICE QUESTION
1. The members of a food chain which convert radiant energy into chemical bond
energy are the
a. producers
b. primary consumers
c. secondary consumers
d. tertiary consumers
e. decomposers
2. It is believed that an increase in the CO2 in the earth’s atmosphere is causing
a. a decrease in the earth’s temperature
b. the depletion of the ozone layer
c. an increase in the U-V radiation reaching the earth
d. the greenhouse effect
e. the pollution of our rivers
3. The terrestrial biome that is characterized by a northern coniferous forest, elk, grizzly
bears and a few annual plants is the
a. tundra
b. temperate deciduous forest
c. taiga
d. grassland
e. desert
4. Which trophic level in the food pyramid to
the right receives the lease amount of energy?
a. Phytoplankton
b. Zooplankton
c. Minnows
d. Tuna
e. Sharks
5. Which of the following crops increases the nitrogen content of the soil?
a. peas
b. barley
c. rice
d. wheat
e. corn
6. The herbivores of a food chain are considered
a. producers
b. primary consumers
c. secondary consumers
d. decomposers
e. autotrophs
7. All of the following are examples of mutualism EXCEPT
a. protozoans living in the gut of termites digest the wood the insects eat
b. nitrogen fixing bacteria in root nodules of legumes produce nitrates
c. barnacles attached to whales acquire transportation
d. lichens living on bare rock
e. green algae harbored by a Paramecium produce carbohydrates
9. Increasing the concentrations of nitrates and phosphates in a lake may lead to all of
the following EXCEPT
a. an algal bloom
b. an eventual decrease in the O2 content of the lake
c. decreased activity of bacterial decomposers
d. eutrophication
e. asphyxiation of fish
10. Lichens play an important role in the process of ecological succession since they
a. represent secondary consumers
b. initiate pond succession
c. are the climax vegetation in a beach community
d. cause eutrophication
e. erode rock and form soil
11. In a laboratory experiment, two species of duckweed, Lemma gibba and Lemma
polyrrhiza were studied. When grown together L. gibba replaces L. polyrrhiza since it
has air sacs enabling it to float and cut off light reaching L. polyrrhiza. As a result L.
polyrrhiza dies. The experiment demonstrates the principle of
a. predation
b. territoriality
c. mimicry
d. competitive exclusion
e. acquired characteristics
12. A group of interacting plants and animals within a biome constitutes a
a. community
b. population
c. society
d. species
e. ecosystem