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- 1. Multiple ChoiceWhich is the best example of predation in an ecosystem?bee and flowerfox and rabbitflea and ratmosquito and human
- 2. Multiple ChoiceMountain pocket gophers are native to Nevada. Which activity of the gopher transfers energy from one trophic level to another in its ecosystem?reproducing with other gopher speciesstoring food undergrounddigging burrows to live ineating the roots of many plants
- 3. Multiple ChoiceWhich represents a positive consequence of competition within an ecosystem?decreased rate of reproductionelimination of inferior organismsincreased need for natural resourceselimination of entire species of organisms
- 4. Multiple ChoiceWhich of these is an abiotic element of a desert ecosystem?sandcactuslizardscorpion
- 5. Multiple ChoiceIf krill is a primary food source for a local population of whales, which will most likely happen to the whales if the krill population suddenly doubles?The whales will have to compete more with each other for available food.The whales will have to find another food source or risk starvation.The whales will migrate to another area.The whales will increase in number.
- 6. Multiple ChoiceWhich human action would most likely increase the population of cave-nesting animals in an ecosystem?cutting nesting treestracking nesting foxesadding nesting boxes
- 7. Multiple ChoiceWhich best describes the effect of human society on a freshwater ecosystem?Movement of minerals and stones due to flowing water in a stream results in a constantly changing water bed.Erosion caused by running water breaking down the river bank changes the geography of the river bed over time.The discharge of hot water into a freshwater ecosystem results in decreased levels of oxygen available to organisms.
- 8. Multiple ChoiceA woodland area where deer live is partially cleared to build homes for people. Which best describes how the deer population will change as a result of clearing the land to build homes?The deer population will increase.The deer population will decrease.The deer population will remain the same.
- 9. Multiple ChoiceWhich is an example of parasitism?cat and mousetadpole and froghuman and tapeworm
- 10. Multiple ChoiceThe following is a food chain observed in a large wilderness park.
Vegetation → Deer → Cougar
A swarm of insects consumes 70% of the vegetation in the park. As a result, which of the following willMOST likely occur?The prey will decrease in numbers.The predator will increase in numbers.The prey will be unaffected.The predator will be unaffected. - 11. Multiple Choice
Which BEST describes the effect on another population in the food web below if nearly all of the field mice are removed?The number of lynx will increase.The amount of grass will decrease.The amount of seeds will increase.The number of ferrets will decrease. - 12. Multiple ChoiceMice, rabbits, bobcats, and squirrels all live in a brush ecosystem. Which animal would have the MOST difficult time surviving if the population of the other three animals continued to decrease?mousesquirrelbobcatrabbit
- 13. Multiple ChoiceMangrove trees are affected by several factors. Which is an abiotic factor contributing to the energy cycle of a mangrove ecosystem?bacteriaclimatefungirocks
- 14. Multiple ChoiceA rainforest area is experiencing a severe drought. As a consequence, the insect population has decreased. What will the insect-eating birds MOST likely do as a result of the drought?stop searching for food until it begins to rainbegin reproducing to increase populationmove to a new area to find foodstart the process of hibernation
- 15. Multiple ChoiceWhich of these organisms is a producer in a marine ecosystem?fishgullalgaeworm
- 16. Multiple ChoiceBees visit flowers for their nectar and in the process pick up pollen, allowing flowering plants to cross-pollinate. Which term best describes the relationship between bees and flowers?mutualismparasitismcompetitionpredator-prey
- 17. Multiple ChoiceAcacia trees and acacia ants maintain a mutualistic relationship. Which best explains what would happen to the trees and ant populations if a disease that affects acacia trees is introduced into the ecosystem?Both populations will increase.Both populations will decrease.The tree population will decrease, but the ant population will increase.The tree population will decrease, but the ant population will remain the same.
- 18. Multiple ChoiceKudzu vines grow by climbing and wrapping around trees. Trees covered by kudzu can die because they are starved of sunlight. What type of relationship exists between the trees and the kudzu growing on them?competitionmutualismparasitismpredator-prey
- 19. Multiple ChoiceWhat accounts for the large difference in plant growth in a tropical rainforest as opposed to a desert?windnitrogenelevationprecipitation
- 20. Multiple ChoiceWhich statement BEST explains why only 10% of the energy produced is transferred to the next trophic level?Only a small percentage of energy is needed at higher levels.Amount of energy remains the same but in different forms.All the energy is used up by primary producersthe energy is lost as heat to the environment.
- 21. Multiple ChoiceThis energy pyramid models the flow of energy between organisms in a Florida ecosystem.Energy is lost between each level.Energy is consumed only at Level 1.The most energy available is at Level 3.Equal amounts of energy are transferred between levels.
- 22. Multiple ChoiceDuring science class, William found out that bacteria live in the soil. Which statement BEST describes the function of bacteria and their impact on soil?Bacteria help increase fertility by decomposing organic matter in the soil.Bacteria help increase fertility by loosening soil for root growth.Bacteria reduce fertility by breaking down minerals in the soil.Bacteria reduce fertility by stripping the soil of nutrients.
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