Changes to the Ecosystem

Which is NOT an example of a natural environmental change?

• a beaver dam
• a hurricane
• a volcanic eruption
• a housing development

In a pond ecosystem, what would happen to frogs if the insect population decreased?

• There would be more frogs in the pond

• There would be more insects in the pond

• There would be less frogs in the pond

• More fish would move to the pond

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If the population of prey increases, the population of predators will ________because of the availability of food.

• decrease

• stay the same

• increase

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An example of a natural change to the ecosystem is:

• A highway built in the middle of the desert. 
• Lightening strikes and starts a fire in the forest. 
• A rancher placing too many grazers in a small area leading to overgrazing.

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What would most likely happen if an ecosystem no longer received sunlight?

• The number of herbivores would increase
• The number of plants would increase
• all organisms would adapt
• All living organisms would eventually die

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How would beavers building a dam cause an increase in the fish population? The dam -

• causes predators to hunt more fish

• removes trees from around the river.

• forces many birds to leave the ecosystem.

• blocks a river and creates a lake.

Natural disasters can also change ecosystems. What can organisms do if a disaster happens?

• Fight, Survive, Struggle

• Move, Adapt, Die

• Stay, Sleep, Survive

• Eat, Sleep, Repeat

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A fire destroys all of the trees and plants in the forest. How might this affect the birds in the area?

• The birds will plant seeds and grow new trees.

• The birds will have more food to eat.

• The birds will plant seeds and grow new trees.

• The birds will have no place to build their homes.

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Changes to an environment may make it more difficult for an organism to find-

• food.

• shelter.

• water.

• all of the above

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Natural disasters like

• Hurricanes

• flood

• drought

• All of the above

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