Ecology Review

A decomposer?

• Eats dead plants or animals and breaks down to put nutrients in the soil
• Eats plants or other animals for food
• Makes its own food
• Machine that gathers trash

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Mosquitos bite humans and suck out blood, which they use as food. The human may become sick from the bite. Which symbiosis is this?

• mutualism

• parasitism

• commensalism

• predation

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The remora, also known as suckerfish, share a relationship with nearby sharks. Remoras have suckers attached to their fins. They attach to the bodies of sharks. The shark provides transportation for the remora. The remora feeds on scraps of food that are left behind. Which symbiosis is this?

• mutualism

• parasitism

• commensalism

• predation

In southern Asia, a mongoose and hornbill bird protect each other. They take turns guarding each other from predators while the other one sleeps. What kind of symbiosis is this?

• mutualism

• parasitism

• commensalism

• predation

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Eutrophication is caused by

• excess nutrients building up in the water.

• industrial point-source pollution.

• unlined landfills and septic tanks.

• wastewater from homes mixing with drinking water.

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How does eutrophication cause the death of aquatic organisms

• the build up of carbon dioxide in the water

• the lack of nitrogen in the water

• the lack of carbon dioxide in the water

• the lack of oxygen in the water

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Which would most likely happen if too many nutrients entered an estuary?

• Nutrients would be used up by the fish and plants, keeping the estuary in balance.

• Algal blooms would lower dissolved oxygen levels, causing fish to suffocate.

• Algal blooms would decrease, leaving few food resources for fish.

• Nutrients would sink to the bottom, increasing soil deposition.

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If a population grows larger than its environmental carrying capacity, then

• death rate may rise.

• death rate may fall significantly.

• birth rate may rise significantly.

• immigration rate may increase.

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What does the term carrying capacity describe?

• The maximum number of birth rates for a population.

• The ability of a population to accept new immigrants.

• The ratio of birth rates to death rates in a population.

• The population size that the environment can sustain.

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What does the graph represent?

• Emigration
• Exponential growth
• Immigration
• Logistic Growth

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