Biodiversity and Succession

Deer are introduced into a grassland ecosystem and their population increases considerably. If the deer population continues to grow, which is the most likely outcome for the ecosystem?

• Biodiversity would decrease and sustainability would decrease

• Biodiversity would increase

• Sustainability would increase

• Biodiversity would increase and sustainability would increase

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

• Succession would begin again, leading to another climax community with Maple as the dominant plant

• Grasses would be become dominant plants in a new climax community

• Drought-resistant shrubs would replace the climax community

• The shrub stage would be become extinct

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NGSS.MS-LS2-2

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Which statement best describes ecosystems?

• They revert back to original state

• They constantly change

• They only exist for a specific length of time

• They never change once they are established

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Diversity among members of a species is important because diversity

• Ensures high levels of competition

• increases the available ecosystem resources

• increase the chances if survival under changing conditions

• ensures the variety of reproductive methods for a species.

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NGSS.MS-LS4-4

The following table lists the number and variety of organisms in four different ecosystems.

Based on the table, which ecosystem is likely the most sustainable?

• Ecosystem 1

• Ecosystem 2

• Ecosystem 3

• Ecosystem 4

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Some students take care of a vegetable garden. When it is time to plant in the spring, the students leave part of the garden empty in order to observe ecological succession. Which of these will most likely occur first?

• Development of topsoil

• Development of a stream

• Growth of trees and shrubs

• Growth of weeds and grasses

In an effort to preserve wildlife on his farm, a farmer decides to stop using a portion of his field. The farmer fences off the area, stops cutting the grass, and stops allowing livestock to graze on it. After twenty years, the area would most likely---

• Be covered with moss and rocks

• Be grown over with bushes and small trees

• Be a mature hardwood forest

• Be made up of only abiotic factors

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NGSS.MS-LS2-1

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Which statement best describes a climax community?

• It contains only plant populations

• Major climate changes will not alter it

• It changes rapidly

• It persists (continues) until an environmental change occurs.

Diversity among members of a species is important because diversity

• increases the available ecosystem resources

• ensure high levels of competition

• increases the chances of survival

• ensures the variety of reproductive methods for a species

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NGSS.MS-LS4-4

How does biodiversity affect sustainability?

• The greater the biodiversity, the greater the sustainability.

• The greater the biodiversity, the lesser the sustainability.

• The lesser the biodiversity, the greater the sustainability.

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NGSS.MS-LS2-5