5.L.2.3 Interactions in Ecosystems

Eelgrass is a major source of food for birds and turtles in an estuary.  What will most likely happen to the bird and turtle populations if people remove the eelgrass to build a bridge?

• The turtle population will increase, but the bird population will decrease
• Both the bird population and the turtle population will increase
• The bird population will increase, but the turtle population will decrease
• Both populations will decrease

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A chemical intended to kill insects and other organisms that damage crops

• nicotine

• pesticide

• sweet tea

• tar

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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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An organism that feeds off another organism and causes it harm. 

• symbiosis
• host
• parasite
• competition

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An organism that is often harmed in a symbiotic relationship with another organism.

• parasite

• competition

• host

• symbiosis

If wolves prey on deer for food, what will most likely happen to the deer population if wolves are removed from an area where deer live? 

• he population of deer will increase. 
• The population of deer will decrease.
•  The population of deer will remain the same.
• The population of deer will become extinct. 

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Meadow moles are small mouse-like animals that eat plants and animals. Their niche in an ecosystem is a?

• omnivore
• herbivore
• producer
• scavenger

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Which would most likely increase the number of squirrels living in an area?

• cutting down trees that serve as habitats for squirrels.
• planting trees that produce nuts squirrels do not eat.
• Reducing the number of animals that hunt and kill squirrels.
• removing all food sources for squirrels from the area.

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Which best explains why many kinds of plants and animals can live together in an ecosystem?

• The plants and animals all care for each other and protect one another.
• The plants and animals are all part of a food chain and depend on each other to live.
• The plants and animals are independent of one another, so they can live together,
• The plants and animals all feed on the same things, so they compete with each other for food.

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Wood ducks build their nests in holes in trees near lakes. If some of the  trees were removed from around the lake, how would the wood ducks be affected?

• Wood ducks would become a new species.
• Wood ducks would lay more eggs in each nest.
• Wood ducks would increase their competition for nests.
• Wood ducks would begin building their nests on the ground.

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