HS-LS2

A Squirrel eats 1250J of energy from walnuts. He excretes 150J as waste and loses 675J as heat.

How much energy is available to the squirrel for growth?

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NGSS.MS-LS2-1

A Squirrel eats 1250J of energy from walnuts. He excretes 150J as waste and loses 675J as heat.

What % of energy is lost as heat?

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NGSS.MS-LS1-7

Consider the population graph of oak trees above. Sometime between the years of 2009 and 2012 a fire broke out and killed several trees. What year did this fire occur?

• 2009

• 2011

• 2012

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NGSS.MS-LS2-4

Now consider this population graph. The acorn birds feed on the acorns of the oak tree. Why did their population drop after the population of oak trees dropped?

• The acorn birds' population dropped after the fire because they were damaged by the fire and their young nests were killed causing a delay in population decline due to the losses of one generation.

• The acorn bird population declined after the oak trees because the acorn birds lost trees to build their nests in.

• Since the acorn birds depend on the acorns for survival, they experience a delay in population decline as at the time of the fire their population was supported by the acorns. Still, then afterward their population shrinks as there is less food available.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which letter represents amplitude? (a)  

• A

• B

• C

• D

• E

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NGSS.MS-PS4-1

A hurricane blows across a Caribbean island. The storm flattens trees, and it

drowns or washes away a large number of plants and animals. As a result of the storm,

the carrying capacity of the island is temporarily reduced for many of the island species.

How is the storm classified as a limiting factor?

• The storm is a density-independent limiting factor, because population size and

  density do not alter the storms effect.

• The storm is a density-independent limiting factor, because its effect depends on the

  size and density of a population.

• The storm is a density-dependent limiting factor, because its effect depends on the

  size and density of a population.

• The storm is a density-dependent limiting factor, because its effect depends on the

  strengths of its wind and rainfall.

Tags

NGSS.MS-LS2-4

In a forest ecosystem, a variety of predators compete with one another for the same prey. The predators include wolves, coyotes, foxes, and hawks. Their prey include deer, rabbits, mice, and the chickens that live outdoors on nearby farms and backyards. Suppose that human activities, such as hunting, drastically reduce the populations of the wolves, coyotes, and foxes. Which statement best explains a likely change to the hawk population?

• The hawk population decreases because of the natural cycle that affects predators

  and prey.

• The hawk population remains constant because competition has no effect on

  carrying capacity.

• The hawk population increases in a pattern of exponential growth, because the

  limiting factors on the population were removed.

• The hawk population increases to a new carrying capacity that is determined by one

  or more limiting factors, such as the availability of food.

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Which of the following is a biotic factor that would affect the carrying capacity of a population?

• Soil

• Predator

• Rainfall

• Sunlight

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NGSS.MS-LS2-2

NGSS.MS-LS2-4

What is the carrying capacity of the graph?

• around 500

• more than 500

• less than 500

• around 600

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Why would the introduction of wolves to this ecosystem cause the populations of fish and grass to increase?

• The introduction of wolves causes the population of grass to increase because they eat grazing animals. This allows more grass to grow, which is good for the ecosystem.

• The introduction of wolves is not what caused the population of fish to increase because they are predators. Therefore, there must be another reason why the population of fish increased when wolves were introduced.

• The introduction of wolves will help to improve the quality of grass, thereby increasing its population and providing food to the fish, which increases its population as well.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4