NGSS.3-LS4-4

Scientists are concerned about overfishing of shark populations. Sharks feed on rays and rays feed on scallops. Without sharks, rays consume all the scallop beds. This situation demonstrates that: 

• humans can improve an ecosystem by removing predators.
• humans can upset an ecosystem by removing species.
• reducing the shark population increases the quantity of scallops that can be taken.
• sharks are not important for the stability of the ecosystem.

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NGSS.3-LS4-4

Highways allow people to travel between towns and cities, but it also divides ecosystems into smaller pieces. Animals can become separated from lakes they use for food and shelter. For example, tiger salamanders use lakes for these reasons. How could the building of highways affect animals such as the tiger salamander?

• Tiger salamanders could improve lake ecosystems.
• Tiger salamanders may be cut off from important resources.
• Tiger salamander habitats may have less pollution.
• Tiger salamander habitats within ecosystems would become larger.

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NGSS.3-LS4-4

In a grassland ecosystem, if the population of eagles suddenly decreased, what will most likely be the effect on the rest of the ecosystem?

• The ecosystem will become overpopulated with snakes
• There will be a decrease in the population of snakes in the ecosystem
• The nutrition of the soil in the ecosystem will decrease
• More types of plants will begin growing in the ecosystem

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NGSS.3-LS4-4

Pollution _________________________.

• is harmful materials put into the environment
• found in air, water, and land
• effects plants, animals, and people
• All of the above

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Which is the result of humans destroying habitats?

• An increase in the number of predators

• An increase in the number of prey

• An increase in the number of endangered species

• An increase in trees

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NGSS.3-LS4-4

As more people have moved to the beach, the sea turtle population has decreased. Which is most likely the cause of this decrease?

• tropical storms

• increase in predators

• habitat loss

• warmer temperatures

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NGSS.3-LS4-4

In a food chain, foxes are consumers of rabbits and mice.

If the mice population suddenly decreases, what will most likely happen to the number of foxes?

• The number of foxes will increase because they will eat fewer rabbits.

• The number of foxes will stay the same because they will eat more rabbits.

• The number of foxes will decrease because they will be eaten by the rabbits.

• The number of foxes will decrease because they will only have one remaining food source.

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NGSS.3-LS4-4

Which of the following is a disadvantage of dams and reservoirs?

• man made lakes used for drinking water, recreation and industry

• hydroelectric power

• existing ecosystems changed, displacing species and humans

• flood control

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NGSS.3-LS4-4

How would the woodpecker population in a forest area most likely be affected if a housing development was built in the area?

• They would produce more offspring.

• They would change the color of their feathers.

• They would experience a decrease in available food.

• They would experience a decrease in competition.

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NGSS.3-LS4-4

What might happen if there were no apex predators in this ecosystem?

• zebra population would grow fast
• other animals wouldn't have enough grass to eat
• the food web would be out balance
• all of the above

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NGSS.3-LS4-4