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1) Which of the following is an example of an ecosystem?
a- Zebras and the lions that prey on them
b- A coral reef together with all the fishes and invertebrates living in and around it.
c- Flowering plants and all the insects and birds that pollinate them
2) To increase his strawberry yield, an organic gardener plants legumes alongside his strawberry bushes rather than using fertilizers. Why did he plant legumes?
a- Legumes have root nodules with nitrogen fixing bacteria
b- Legumes convert ammonium to nitrates
c- Root nodules on legumes have denitrifying bacteria
d- Legumes are an immediate source of phosphorous and nitrogen
e- Root nodules on legumes produce nitrifying bacteria.
3) Which of the following is not a renewable source?
a- Fossil fuels
b- Food crops
c- Water
d- Wild game
e- Solar energy
4) Which of the following is LEAST responsible for soil erosion?
a- Poor landscaping practices that expose the land to excess wind
b- Overgrazing by livestock
c- Use of drip irrigation systems
d- Deforestation
e- Wetland destruction
5) Which of the following has not contributed to declines in the world’s fish catch in recent years?
a- Depletion of fish populations through overfishing
b- Use of aquaculture/aquafarming
c- Herbicide and pesticide use
d- New technologies that increase fishing efficiency
e- Water pollution
6) In which ways does overfishing lead to decreased biodiversity?
a- It reduces the available habitat for other species.
b- Overfishing allows fished species to overpopulate once the larger individuals are removed from the population, which in turn depletes the specie’s food source.
c- Newer technologies allow the fishing fleet to take a larger catch while leaving larger numbers of breeding pairs, which overpopulate and degrade the environment.
d- It depletes fish that feed on some species and serve as food sources for other species, leading to the eradication of some species and the overpopulation of others.
e- It depletes food sources for aquatic mammals, which then overpopulate.
7) Mercury can enter an aquatic food chain and collect in fish as well as people who eat fish. This is an example of which of the following processes?
a- Biotic potential
b- Biological magnification
c- Salinization
d- Bioremediation
e- Biological accumulation
8) How does the use of minerals such as metals differ from the use of fossil fuels?
a- Fossils fuels are more plentiful than metals, and are depleted more slowly.
b- Metals can be extracted by strip mining, while fossils fuels may not.
c- Many metals may be recycled, decreasing the necessity for finding new reserves, unlike fossil fuels, which cannot be recycled.
d- The mining of metals is not as destructive to the environment as the mining of fossil fuels.
e- The recycling of fossil fuels is more economically feasible than the recycling of metals.
9) Forests help to regulate the global climate by
a- Releasing oxygen
b- Absorbing carbon dioxide
c- Preventing soil erosion
d- Absorbing pollutants
e- Emitting ozone
10) Which of the following is/are suspected of causing climate change?
a- Fossils fuel usage, deforestation, and agriculture
b- Overfishing and hydropower usage
c- Fossil fuel and hydropower usage
d- Salinization and desertification
e- Erosion, deforestation, pollution and salinitization
Explanation / Answer
1.) b 2.) a 3.) a 4.) c 5.) d 6.) d 7.) b 8.) c 9.) A 10.) a
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