SB5A Ecology

Is this standard 5a?

Plan and carry out investigations and analyze data to support explanations about factors affecting biodiversity and populations in ecosystems.

• True

• False

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Which of the following statements describes density-independent limiting factors? SB5a

• Environmental extremes, such as a hurricane or drought, are examples.

• Competition is an example.

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A population is increasing in a pattern of logistic growth. What happens when the population reaches carrying capacity? SB5a

• The size of the population remains at or near its maximum.

• The size of the population continues to grow exponentially.

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The wolves and moose of Isle Royale are the focus of the longest-running study of a predator-prey system in the wild. Both are recent arrivals to Isle Royale: moose swam to the island in the early 1900’s. Wolves followed decades later, traveling over the ice from Canada in the 1940’s. About 40 years into the study, the wolf population crashed when humans introduced the canine-parvovirus. Additional factors over the years have impacted both populations. At one point during the study, the moose population collapsed during the most severe winter on record followed by an outbreak of moose ticks.

What point on the graph represents the outbreak of moose ticks and a drastic decline in the moose population? 5Ba

• Point A

• Poin B

• Point C

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• unlimited resources and no competition

• the introduction of a food source that bacteria cannot use

• high competition for limited resources

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NGSS.MS-LS2-1

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Vernon is studying the population of deer in a tract of forest. He gathers the following data.

Birth rate: ~50 deer/year Death rate: ~70 deer/year

Which additional observation would support the conclusion that the deer population is NOT changing size from year to year, meaning that the net population change is 0? SB5a

• The organism's preferred habitat.

• The kind of place an organism occupies.

• About 20 deer per year immigrate to the tract of forest.

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A parasite is an organism that _____________________________.

SB5a

• Both helps and harms another organism

• Only harms another organism

• Only helps another organism

• Neither helps or harms another organism

Which one of the following describes, in part, the niche of a rabbit? SB5a

• the wind in the area it lives.

• the golf course it lives on and eats grass on.

• rabbits are eaten by coyotes

• sunlight

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The difference between a habitat and a niche is that a niche is? SB5a

• The specific functional role of an organism.

• The organism's preferred habitat.

• The kind of place an organism occupies.

• None of the above.

The graph shows the changes in population size of two species that live in the same habitat. Which conclusion can be made regarding the species? SB5a

• Species 2 is a predator of Species 1

• Species 1 is a predator of Species 2

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NGSS.MS-LS2-1

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