Natural Disturbances That Affect Ecosystems

Select the natural disturbance to an ecosystem

• Clearing land for a new intersection.

• Cutting down trees in a forest for wood to build houses.

• A hurricane's strong winds blowing trees.

Some damaged ecosystems can recover after a disturbance

• True

• False

Ecosystems only change slowly after natural disturbances.

• True

• False

How does the biodiversity in an ecosystem relate to how quickly an ecosystem can recover from a disturbance?

• The number of species increases the ability of the ecosystem to recover from disturbance.

• The number of species decreases the ability of an ecosystem to recover from the disturbance.

• The number of species present in an ecosystem remains constant before an after a disturbance.

• The number of species does not affect the time needed for an ecosystem to recover from a disturbance.

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What is secondary succession?

• The process of ecosystem recovery following natural disturbances, often reproducing the original climax community.

• The process of ecosystem recovery following human-caused disturbances.

• The process of ecosystem recovery following disturbances, resulting in a completely new community.

• The process of ecosystem recovery following disturbances, resulting in the extinction of all species.

Answer explanation

Secondary succession refers to the process of ecosystem recovery following natural disturbances. This process often leads to the reproduction of the original climax community. This means that the ecosystem gradually returns to its original state, rather than resulting in a completely new community or the extinction of all species. This is why the correct answer is 'The process of ecosystem recovery following natural disturbances, often reproducing the original climax community.'

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How do ecosystems change over time?

• Ecosystems change over time, especially after disturbances, as some species die out and new species move in.

• Ecosystems remain static and do not change over time.

• Ecosystems only change due to human activities.

• Ecosystems change randomly and unpredictably.

Answer explanation

The correct answer is that ecosystems change over time, especially after disturbances, as some species die out and new species move in. This is because ecosystems are dynamic and constantly evolving. Disturbances such as natural disasters, disease outbreaks, or human activities can cause some species to die out, while creating opportunities for new species to move in and establish themselves.

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Which ecosystem is more likely to survive a change in the environment?

• One with High biodiversity

• One with Low biodiversity

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Why is biodiversity in an ecosystem so important?

• Because it can help humans where to determine good places to develop farm land.

• Because places that have a healthy biodiversity are unaffected by major disturbances.

• Because having a high biodiversity allows for fewer opportunities of competition for similar resources.

• Because having a high biodiversity allows ecosystems to withstand disturbances (major changes).

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What happened to the biodiversity in Yellowstone national forest with the addition of wolves to that temperate forest ecosystem?

• Increased

• Decreased

• Stayed the same

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Which of the following is a natural disturbance that can affect an ecosystem?

• A volcanic eruption

• Deforestation by humans

• Urban development

• Agricultural expansion

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