Ecology Checkpoint

For the growth curve to continue increasing, which of these must occur?

• The organisms must adapt to a new habitat.

• The organisms must migrate to a new environment.

• The resources in the environment must be unlimited

• The environment must provide a habitat for a large variety of organisms.

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NGSS.MS-LS1-5

NGSS.MS-LS2-1

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Seaweeds occupy an important niche in the Chesapeake Bay ecosystem.  Which question will best help a student identify the role of seaweeds in this ecosystem?

• Which organisms depend on seaweeds as an energy source?

• Which seaweed species produces the greatest amount of oxygen?

• What wavelengths of light are photosynthesized by seaweed species?

• What salinity in areas where seaweed is growing?

  What salinity in areas where seaweed is growing?

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NGSS.MS-LS2-1

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In a population of 120 oak trees, 25% of the population has oak wilt disease.  What is the number of trees in this population that have oak wilt?

In an ecosystem, a sudden decrease in the number of bacteria in the soil would most likely result in-

• increased water pollution in the soil

• increased precipitation and flooding of the soil

• a reduction in the amount of nitrogen available to the ecosystem

• a decrease in the number of fossils formed in the soil

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NGSS.MS-LS2-1

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This food chain can be found in the coastal waters of Virginia.  The population of which organisms in the food chain would be the first to decline if commercial fishing over-harvested shrimp?

• Algae

• Zooplankton

• Damselfish

• Barracuda

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NGSS.MS-LS2-1

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According to the energy pyramid, the most energy is present in organisms living at the same level as the-

Responses

• bobcat

• birds

• grasshopper

• grass

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NGSS.MS-LS2-3

Most populations introduced to a new ecosystem grow until factors such as lack of food and overcrowding limit their growth, as illustrated above.  What does the portion of the graph labeled B represent?

• Birthrate decrease

• Slowing growth

• Death rate increase

• Exponential growth

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following is a climax community?

• 
• 
• 
• 

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NGSS.MS-LS2-4

The diagram represents succession in a temperate deciduous biome.  Which statement best describes what would happen if a fire destroyed all the organisms in the climax stage?

• Drought-resistant shrubs and succulent plants would replace the climax stage.

• The shrub stage would become extinct

• Succession would begin again, leading to another climax stage.

• Grasses would become dominant plants in a new climax stage.

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NGSS.MS-LS2-1

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Orchids grow on large tropical trees.  The orchids depend on the support offered by the trees but do not harm the trees. This is an example of?

• Mutualism

• Commensalism

• Parasitism