Organisms & Environment 7th Grade

Which of these explains why an ecosystem is healthy when it has a variety of species?

• An increased number of species allow for fewer food chains

• a larger number of species allows for greater diversity in interdependence

• a large number of species reduces competition for abiotic resources

• an increased number of species contributes to greater chances for adaptability

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Which environmental factor would most likely prevent an orange tree from surviving in the desert?

• the lack of moisture

• the high levels of heat

• the extra amount of wind

• the low levels of sunlight

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Which interaction within an ecosystem is characterized by gradual change from one community of organisms to another?

• symbiosis

• food webs

• energy pyramids

• succession

In which way are rainforests and coral reefs different from ecosystems with few species?

• there are more prey than predators

• the food web is more stable and lasting

• organisms often must compete for food

• plant populations are the primary producers

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The series of diagrams shown represents ecological succession.

What type of community is shown in Diagram 1?

• a desert ecosystem

• a tundra ecosystem

• a pioneer community

• a climax community

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Some plant species and animal species depend on each other. Which of these animals help thousands of plant species to reproduce?

• honnybees

• earthworms

• squirrels

• beetles

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A research scientist writes a paper on the initial regrowth of a forest after a fire has damaged the entire ecosystem. Which title would be best for the paper?

• Primary Succession

• Stable Communities

• Climax Communities

• Secondary Succession

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High average daily temperatures and heavy annual precipitation are found in a ...

• desert

• grassland

• rainforest

• tundra

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Deer are introduced into a grassland ecosystem and their population increases considerably. If the deer population continues to grow, which is the most likely outcome for the ecosystem?

• biodiversity would decrease, and sustainability would decrease

• biodiversity would decrease, and sustainability would increase

• biodiversity would increase, and sustainability would increase

• biodiversity would increase, and sustainability would decrease

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After a volcanic eruption, it takes a long time for large ecosystems to fully recover. Which statement best explains why the development takes so long?

• space is limited for growth

• the quality of light is low

• soil must be created

• minerals are destroyed

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