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- 1. Multiple Choice
The number of living organisms in and around a lake remained fairly stable throughout the month of June. In July there was a three-week period of high temperatures and no rainfall. This resulted in an overabundance of green algae that almost covered the surface of the lake. This would MOST likely result in
a decrease in the amount of bacteria
a decrease in the amount of oxygen
an increase in the water temperature.
an increase in the fish population.
- 2. Multiple Choice
Deforestation in the rainforest can lead to localized extinctions of populations of some organisms. Once an area is deforested, which is MOST likely to decrease and result in organisms’ extinctions?
the amount of annual rainfall
competition between consumers
the energy available to producers
diversity of the resources in the habitat
- 3. Multiple Choice
Approximately 50 million acres of tropical rainforest are cleared each year. Which effect MOST likely would result from the clearing of these forests?
a decrease in soil erosion
a decrease in biodiversity
an improvement in air quality
an improvement in water quality
- 4. Multiple Choice
Which is the BEST example of an organism using behavior to maintain homeostasis?
A snake moves from a sunny area to a shady area to cool down
An elephant uses low-frequency sound waves to find its herd.
A chameleon’s skin becomes green when it sits on a leaf.
An alewife turns when other members of its school turn.
- 5. Multiple Choice
Which statement correctly describes a soil interaction in the carbon cycle?
Microbes breaking down organic matter in the soil release carbon dioxide.
Decaying organisms in the soil absorb carbon dioxide.
Plants growing in the soil release carbon dioxide
Plowing of the soil absorbs carbon dioxide.
- 6. Multiple Choice
What is the relationship between an ecosystem and a community?
A community is a very large ecosystem.
An ecosystem is a very large community.
An ecosystem includes a community and abiotic factors
A community includes an ecosystem and abiotic factors
- 7. Multiple Choice
Braconid wasps lay their eggs on tomato hornworms. The eggs hatch and feed on the worms until they are ready to pupate, when they form egglike structures on the worms’ backs. Which BEST describes the relationship between the braconid wasp and the tomato hornworm?
parasite and host
predator and prey
producer and consumer
primary and secondary consumers
- 8. Multiple Choice
Which will MOST likely occur if the number of grasshoppers decreases?
The northern harrier population will increase
The lizard population will increase.
The cordgrass population will decrease.
The killdeer population will decrease.
- 9. Multiple Choice
During which year did the population MOST likely encounter a severe drought and forest fire?
1992
1993
1995
1996
- 10. Multiple Choice
Fires in forests from lightning rid the forest of dead branches and leaves. If the trees survive and the soil remains intact, the forest will experience regrowth to its climax state by which process?
tropism
succession
gradualism
eutrophication
- 11. Multiple Choice
A prey population typically increases when its primary predator is removed from the ecosystem. What MOST likely happens after this increase in the prey population?
Other members of the ecosystem become predators and hunt the prey.
Disease transmission affects the prey’s ability to reproduce.
Food shortages and disease reduce the prey population.
Humans successfully manage the prey population.
- 12. Multiple Choice
Nonnative plants can take over areas that were once populated by native plant species. Which abiotic process is LEAST likely to cause the invasion of nonnative plants?
flooding
weathering
dust storms
melting glaciers
- 13. Multiple Choice
The numbat, a small Australian marsupial, requires fallen logs and dead trees for shelter and for its primary food, termites. Loss of old-growth forests containing logs and dead trees could threaten the numbat with extinction. What would be the BEST method to protect the numbat from extinction?
provide feeding stations with termites for the numbats
protect areas of old-growth forest from clear-cutting
prohibit hiking in forests where numbats live
move the numbat to a different habitat
- 14. Multiple Choice
The removal of waste from Florida’s East Bay and Pensacola Bay is intended to speed the bay ecosystem’s natural tendency to do which of the following?
adapt to a changed landscape
undergo ecosystem progression
return to its pre-pollution conditions
produce organisms that can survive changed conditions
- 15. Multiple Choice
Which link in the food chain shown would MOST likely have the greatest biological magnification of a harmful non-biodegradable substance?
tertiary consumer
secondary consumer
primary consumer
producer
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