Human Impact on Ecosystems

Which of the following helps a species cope with environmental changes?

• Low genetic diversity

• No genetic diversity

• High genetic diversity

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Species with low population numbers are more likely to be negatively impacted by fluctuations (shifts) caused by ______.

• Climate change

• Disease

• Habitat fragmentation

• All of the Above

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What happens to an ecosystem when a keystone species is removed?

• Loss of a keystone species has no impact.

• Loss of a keystone species has little impact.

• Loss of a keystone species has a large impact and the stability of ecosystem is in jeopardy

• None of the Above

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Which of the following are ways humans can cause the loss of biodiversity within an ecosystem?

• Habitat destruction

• Pollution

• Over-fishing / Over-hunting

• All of the Above

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The greatest cause of biodiversity loss today is

• Pollution

• Habitat loss

• Climate Change

• Invasive species

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Biodiversity, aka biological diversity, usually refers to

• the same species in a general location

• the number of different species in a given area

• the number of animal species in a given area

• the number of plant species in a given area

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Why is "A" less biodiverse than "B"?

• Image "A" is more biodiverse.

• Image "A" has many corn plants and this makes it have high "rich" biodiversity.

• Image "A" has a lot more plants than image "B"

• Even though "A" has a lot of corn plants they are all the same species and makes this a low "poor" biodiverse area.

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NGSS.MS-LS2-5

The use of fertilizers on farmland can eventually cause an overgrowth of algae to appear in surrounding aquatic ecosystems. What process contributes to the eutrophication (excessive richness of nutrients) of these water sources and the increased growth of algae?

• A decreased use of water by animals

• An increase in runoff after heavy rains

• An increase in the sedimentation of rivers

• A decrease in the erosion of creek beds

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The presence of wastes, such as plastic bags and motor oil, in lakes and streams miles away from developed areas suggests that

• .ecosystems are interconnected and human action can alter ecosystem equilibrium.

• recycling programs have failed to conserve biotic resources.
  
• natural processes can alter ecosystem stability.
•  direct harvesting practices have led to irreversible destruction of ecosystems.

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How do invasive plants damage the environment?

• Compete with native species
• Change plant community
• Alter diversity
• All of these

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