L4C Effects on Organisms and Ecosystems

Which is most likely to happen if an ecosystem does not receive sunlight for a long time?

• All living organisms would eventually die.

• The number of plants would be increased.

• All living organisms would eventually adapt.

• The number of herbivores would be increased.

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When the predator population in an ecosystem decreases, which will most likely happen to the prey population?

• The prey population will die out.

• The prey population will decrease.

• The prey population will gradually increase.

• The prey population will move to another ecosystem.

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Which best explains how organisms in an overpopulated community interact with each other?

• They compete with each other for food and survival.

• They occupy different habitats to avoid overcrowding.

• They work together to gather food for their community.

• They use fewer resources so that there is enough for each organism.

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Which is most likely an effect of construction on a forest ecosystem?

• Construction will decrease the amount of sunlight for the ecosystem.

• Construction will increase the amount of food for organisms in the ecosystem.

• Construction will increase the number of trees and smaller plants growing in the ecosystem.

• Construction will decrease the amount of natural cover and nesting places for organisms in the ecosystem.

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Which would most likely cause a decrease in the predator population in an ecosystem?

• an increase in the types of plants in the ecosystem.

• a decrease in the prey population in the ecosystem.

• an increase in the height of trees in the ecosystem

• a decrease in the types of decomposers in the ecosystem.

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When is an ecosystem able to best support a variety of organisms?

• when only one type of shelter is available

• when organisms share food and habitats equally

• when organisms use the parts of the ecosystems differently

• when there is a high level of competition for food among organisms

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Competition in an ecosystem occurs when

• animals get bored.

• more than one individual or population in an ecosystem relies (needs) the same limited resource.

• there is more than enough of a resources for every living organism.

• resources are unlimited.

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If a disease strikes the snake population in the food chain shown, what will be the initial effect on the populations of hawks and rabbits?

• The populations of hawks and rabbits will decrease.

• The populations of hawks and rabbits will increase.

• The population of hawks will increase. The population of rabbits will decrease.

• The population of hawks will decrease. The population of rabbits will increase.

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Trapping has severely reduced the population of rabbits in an ecosystem, as shown in the bar graph below. What is the most likely effect this will have on other organisms?

• The hawk population will increase rapidly and the rabbit population will decrease rapidly.

• The snake population will decrease rapidly and the grass population will increase rapidly.

• The grass population will decrease rapidly and the snake population will increase rapidly.

• The grass, rabbit, snake, and hawk populations will all decrease rapidly.

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Environments include both _____ and _____ things.

• resources; factors

• air; water

• living; nonliving

• buildings; animals

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