Succession, Niches, Trophic Cascades, and More

Which type of succession occurs on a surface where no ecosystem has existed before?

• primary
• secondary
• tertiary

Which of the following is an example of secondary succession?

• new islands created by volcanic eruption

• areas exposed when a glacier retreats

• regrowth after wildfire in California

In the mid 1900's, the wolves of Yellowstone were deeply affected by humans and their population significantly decreased-- making them endangered, and eventually removing them completely from the Yellowstone ecosystem. The removal of wolves, the apex predator, caused what to happen to the biodiversity within Yellowstone?

• A trophic cascade affected the entire food web in Yellowstone, causing some trophic levels to experience decreases, and others to grow rapidly.

• Biodiversity increased when the wolves disappeared and more species were able to flourish without the wolves.

• A trophic cascade irreversibly ruined the ecosystem in Yellowstone--destroying biodiversity forever.

• The biodiversity of the park was not affected when the wolves were removed.

Tags

NGSS.MS-LS2-4

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Based on the graph shown, what is the effect of removing a keystone species from an ecosystem?

• biodiversity goes up
• biodiversity goes down
• biodiversity stays about the same
• not enough information to tell

Tags

NGSS.MS-LS2-4

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What does the graph tell you about biodiversity between 1600 and 1959?

• biodiversity has increased

• biodiversity has decreased

• biodiversity has remained about the same

• not enough information to tell

Tags

NGSS.MS-LS2-4

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What is a keystone species?

• A species that helps to hold an ecosystem together

• A species that lives in or around rocks

• Keys and stones have nothing to do with ecology

• A keystone isn't a living thing, it's just a stone

Tags

NGSS.MS-LS2-4

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The term for the role an organism has in the community.

• niche
• habitat
• tolerances
• competition

An organism's _________ is defined as the environment in which it lives.

• habitat
• niche
• social structure
• ecosystem

Tags

NGSS.MS-LS2-4

A place where an organism lives.

• Terrain
• Habitat
• Community
• Population

A collection of organisms that make up a community as well as all of the nonliving aspects of the environment.

• Population
• Community
• Habitat
• Ecosystem

Tags

NGSS.MS-LS2-3