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Grace is investigating competition in a woodland ecosystem. She created this food web to show her observations. Which of the behaviors that she observed may lead to competition?

• Blue birds and lizards eat worms.

• Blue birds eat grass, snails, and worms.

• Eagles eat rabbits, blue birds, and lizards.

• Rabbits eat only grass.

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NGSS.MS-LS2-1

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

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If there was a wildfire in the forest that destroyed the plant life, what would happen to the herbivore population?

• Herbivores would decrease due to a lack of food

• Herbivores would increase due to an increase of food

• Herbivores would not be affected

• Herbivores would decrease due to an increase in predators

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

What happens if a population goes over its carrying capacity?

• It will continue to grow

• It will eventually decrease due to a lack of resources

• It will die immediately

• It will get unlimited resources

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following would lead to a decrease in tertiary consumers?

• An increase in herbivores and omnivores

• An increase in rain

• A decrease in competition

• A new carnivore population moving to the area

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

What would happen to the hedgehog population if more foxes were introduced to the population?

• Increase

• Decrease

• Stay the same

• What are hedgehogs?

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

Which of the following is a biotic limiting factor?

• The amount of breathable oxygen available to a population.

• Food available for organisms.

• The nitrogen to oxygen ratio in the air supply.

• The number of bodies of water in a habitat.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following are abiotic limiting factors?

• The decomposers in an ecosystem.

• The populations of producers in a given habitat.

• Carrying capacities of several species.

• Water, space, and oxygen.

Predator population lags behind prey population because:

• Increase in predators leads to decrease in prey

• Increase in predators leads to increase in prey

• Increase in predators leads to decrease in producers

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

In the following graph, the predator and prey populations change over time. What is the reason for the predator population decreasing?

• The predator eats the prey

• The prey is eaten by the predator

• The predator runs out of food when the prey population is low

• The prey survives longer when the predator population is low

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4