Changes in Ecosystems

What is the best definition of an ecosystem?

• All the non-living parts of an environment

• All the living parts of an environment

• All the living and non-living parts of an environment

All the following are an ecosystem EXCEPT a

• Lake

• Meadow

• Crater on the Moon

• Rainforest

A place that gives an organism all it needs to live is called a

• Habitat

• Ecosystem

• Competition

• Factor

If a farmer added more fish to his small pond, what effect might this have on the population and the pond

• The fish would not grow much if there is not a lot of room and the plants and other food the fish eat would decrease.

• The fish would grow bigger and the other foods would increase

• The pond would not be affected.

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NGSS.MS-LS2-4

NGSS.MS-LS2-1

What would happen to the squirrel population if all the oak trees were cut down and there were no more acorns?

• The squirrel population would stay the same

• The squirrel population would increase

• The squirrel population would decrease

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The factors that limit or affect a population are

• food, water, light and living space

• food and water

• light and living space

• food and light

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What would happen if most of the fish in a freshwater pond died from a disease?

• The population of water lilies would decrease

• The duck population would increase

• The population of animals that ate fish might also decrease

• The fish population would increase

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NGSS.MS-LS2-1

What is the struggle for the same limited resources called?

• resources

• factors

• competition

• comparison

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Non-native species can grow rapidly in an ecosystem because

• Predators in an ecosystem are not used to hunting them

• they have no competition for resources

• they have no prey

• non-native species are always the top of the food chain

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I will ACE this test tomorrow.

• YES

• NO