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- 1. Multiple Choice
A plant is placed in a closed terrarium exposed only to sunlight with snails and soil decomposers. What must happen for the carbon cycle to continue in this terrarium?
all organisms must continue to exchange gases
the snails must double their production of carbon dioxide
the plant must produce carbon dioxide at a faster rate
the decomposers must begin to produce oxygen
- 2. Multiple Choice
In nature, which type of behavior causes animals to produce aggressive displays and sounds?
imprinting
territoriality
conditioning
habituation
- 3. Multiple Choice
What will most likely occur if the population of the world continues to increase at predicted rates?
there will be an increase in biodiversity as a result of improvements in technology
there will be more rapid depletion of natural resources
the human race will rapidly become extinct
all human diseases will be eliminated
- 4. Multiple Choice
What will most likely happen if a nonnative species is introduced into a stable ecosystem?
the native species will change their diet, and the ecosystem will remain stable
the native species will move to another area, and the ecosystem will remain stable
the native species will have to compete for resources with the nonnative species, and the ecosystem will become unbalanced
the native species will share their food with the introduced species, and the ecosystem will become unbalanced
- 5. Multiple Choice
Which statement best explains how sweating during exercise maintains homeostasis?
it regulates mineral concentrations in cells
it regulates body temperature
it maintains water balance
it maintains sugar levels
- 6. Multiple Choice
Which statement best explains why animals are considered heterotrophic?
they are able to produce food through the process of photosynthesis
they are able to produce food through the process of respiration
they are able to obtain nutrients by decomposing plant and animal tissue
they are able to obtain nutrients by consuming other organisms or their products
- 7. Multiple Choice
In some ecosystems, wolves have been eliminated due to their threats to humans. How can the reintroduction of wolves benefit the ecosystem?
it can eliminate weak animals from a prey population, thereby decreasing competition for natural resources
it can eliminate the most fit animals among the prey population, which will cause an increase in birthrates of the prey
it can cause the prey population to migrate to other areas, resulting in more fit prey
it can cause the prey population to better blend in with the environment
- 8. Multiple Choice
What will most likely be the result as humans move into new areas, forests are clear cut, and housing developments are built?
global temperatures will decrease because trees are removed
many organisms will lose their homes because their habitats have been destroyed
better sanitation in the area will reduce the amount of pollution
the rainfall in the area will increase because there will be increased runoff
- 9. Multiple Choice
What activity most contributes to the depletion of the ozone layer?
burning fossil fuels
release of CFCs
deforestation
overuse of fertilizers
- 10. Multiple Choice
Which will most likely result in a negative growth rate in the human population of a country?
the death rate is higher than the birth rate
the birth rate is higher than the death rate
the country has improved economic conditions
the country has made improvements in sanitation
- 11. Multiple Choice
Why are many farmers encouraged to plant different types of crops on the same land throughout the year?
it prevents insects from destroying crops
it provides more food to other countries
it allows for more genetic variation in plants
it helps to preserve the quality of the soil
- 12. Multiple Choice
The number of individuals that can be supported by an ecosystem is the:
population growth
carrying capacity
population limit
population range
- 13. Multiple Choice
A type of symbiosis in which both species benefit is called?
mutualism
commensalism
parasitism
predator/prey
- 14. Multiple Choice
A type of symbiosis in which one species benefits and the other is harmed is called?
mutualism
parasitism
commensalism
competition
- 15. Multiple Choice
A type of symbiosis in which one species benefits and the other is unaffected is called?
mutualism
parasitism
commensalism
competition
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