Biomes Unit Test Review

Which type of species is the first to occupy a bare site?

• pioneer

• successive

• primary

• invasive

Which term refers to the process of plant communities changing over time?

• ecotone

• succession

• regression

• evolution

What is the natural nutrient enrichment of a shallow lake, estuary, or slow moving stream called?

• oligotrophy

• eutrophication

• upwellings

• red tides

Ecological succession is the

• process of change in an ecological community over time.

• passing down of advantageous traits to offspring.

• an organism's ability to survive an environmental change.

• the creation of a new species within an ecosystem.

The Edwards Plateau in west-central Texas is home to a diverse group of bats, reptiles, and birds. How does the biodiversity of the Edwards Plateau affect the sustainability of local ecosystems?

• The variety of interactions among the different species helps the ecosystems remain sustainable.

• The variety of interactions among the different species prevents the ecosystems from being sustainable.

• The uniformity of interactions among the different species prevents the ecosystems from being sustainable.

• The uniformity of interactions among the different species helps the ecosystems remain sustainable.

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Kelp forests are formed by thick concentrations of brown seaweed in ocean waters. They are home to a high number of plants and animals, including sea otters. What happened when people hunted large numbers of sea otters as a resource from within the kelp forest?

• The kelp forest’s biodiversity increased, and there were more sea otters to use as a resource.

• The kelp forest’s biodiversity decreased, and there were fewer sea otters to use as a resource.

• The kelp forest’s biodiversity decreased, and there were new types of sea otters to use as a resource.

• The kelp forest’s biodiversity increased, and there were new types of sea otters to use as a resource.

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Sustainability is defined as the ability of an ecosystem to survive over time. How does biodiversity affect the sustainability of an ecosystem?

• It introduces fewer new species of organisms.

• It helps to keep the ecosystem balanced.

• It allows organisms to avoid competition.

• It creates a constant state of change.

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Which of the following is the best evidence of a biodiversity crisis according to ecological scientists?

• increasing pollution levels

• climate change

• the incursion of a non-native species

• high rate of extinction

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The illustrations below show five stages in the ecological succession of a pond and some of the organisms associated with each stage. What is the main process being depicted in these stages?

• Photosynthesis in aquatic plants

• The water cycle in a pond ecosystem

• The ecological succession of a pond

• The migration of animals in a forest

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Based on the stages shown in the ecological succession of a pond, which stage is most likely to have the greatest diversity of aquatic organisms?

• Stage 1

• Stage 3

• Stage 4

• Stage 5

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