DOL Natural Processes Part 1

What is the primary purpose of examining how natural processes like succession restore ecosystems?

• To promote human intervention

• To disrupt natural processes

• To understand and facilitate ecological recovery

• To eliminate biodiversity

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When examining the recovery of an ecosystem, which type of succession often follows a forest fire, agricultural abandonment, or a clear-cutting event?

• Primary succession

• Secondary succession

• Climax succession

During ecological succession, how does the growth of young hardwoods affect the organisms living in an ecosystem?

• Grasses and low shrubs are unable to obtain the amount of light they need to survive, so there are small numbers of them

• The trees provide shelter and food for a variety of mammals, insects, and birds.

• In autumn, falling leaves provide a source of energy for decomposers such as fungi.

• All of the above.

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Surtsey is an island located south of Iceland. The island was formed by a volcanic eruption and first appeared in 1963. The table below contains descriptions of changes in the population and diversity of species on Surtsey. Which of these lists the descriptions in the correct order of ecological succession on Surtsey?

• I, II, IV, III

• III, I, II, IV

• IV, III, I, II

• II, IV, I, III

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Ecological succession refers to the gradual process by which ecosystems change and develop over time. Which of the following best describes primary succession and secondary succession, and their role in habitat restoration?

• Primary succession occurs on bare rock or land with no soil, while secondary succession occurs in areas where a disturbance has left the soil intact; understanding these processes helps restore habitats by guiding the reestablishment of plant and animal communities.

• Primary succession occurs in areas with existing soil, while secondary succession happens on bare rock; understanding these processes is not relevant to habitat restoration.

• Both primary and secondary succession occur only in aquatic environments; understanding these processes does not contribute to ecosystem restoration.

• Primary succession and secondary succession are unrelated to ecosystem changes; their understanding does not aid in habitat restoration.

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What is ecological succession?

• The process of species extinction

• The gradual process of change in an ecosystem's species composition and structure over time

• The immediate response to natural disasters

• The migration of animals

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Ecological succession occurs as ecosystems respond to disturbances or develop on previously ______ substrates.

• lifeless

• fertile

• inhabited

• stable

Which of the following is an example of primary succession?

• Forest regrowth after a fire

• Formation of an island through a volcanic eruption, where pioneer species like lichens and mosses colonize the barren landscape

• Reestablishment of grasses and shrubs

• Restoration of habitats by experts

After a forest fire, which type of ecological succession occurs?

• Primary succession

• Secondary succession

• Tertiary succession

• None of the above

In secondary succession, the ecosystem has been disturbed, but ______ and remnants of the previous community remain.

• soil

• water

• air

• rocks

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