Ecosystems: Living Things and the Environment

After a catastrophic wildfire that clears the land of all plants and trees, -

• plants will not grow again in the burned area.

• bushes will grow in the area before weeds grow.

• weeds will grow in the area before trees grow.

• only trees will grow in the burned area.

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What factor contributes most to the sustainability of a habitat?

• Competition among large predators

• Large variety of organisms

• Presence of volcanic rock

• Absence of bacterial species

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Scientists studying two adjacent ecosystems observe different varieties of organisms in the two areas. All of the following factors would contribute to the differing varieties of organisms in these two habitats EXCEPT -

• climate.

• soil type.

• water resources.

• wind.

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The ecosystem with the greatest sustainability will be the one that has the –

• greatest variety of different organisms.

• greatest variety of different organisms.

• lowest population of harmful insects.

• fastest growing season for green plants.

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The Brazilian rain forest is an area with significant biodiversity. As the rain forest is replaced with agricultural land, it is reasonable to predict a reduction in –

• consumption of solar energy.

• sustainability over time.

• precipitation levels.

• average daily temperature.

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The ocean ecosystem has a high sustainability because of -

• strong, persistent currents.

• predator/prey relationships.

• green plants growing on the bottom.

• the large variety of different organisms.

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As species disappear from a prairie ecosystem, their disappearance results in decreased –

• sustainability of the prairie ecosystem.

• numbers of species in nearby ecosystems.

• likelihood of prairie wildfires breaking out.

• numbers of offspring in remaining species.

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An example of a typical pioneer species, that is one that appears in the earliest stages of ecological succession, is –

• oak trees

• spiders

• weeds

• humans

Primary succession takes place in an area where -

• no soil or organisms were previously present.

• wildfires removed existing prairie grass species.

• large organisms outcompete smaller organisms.

• weeds grow in a garden next to vegetables.

Plants that have deep roots, which extend, are able to reach cooler regions and absorb water that the roots of other plants can’t reach. This adaptation is expected in a habitat with which of the following climatic conditions?

• Cool and sunny

• Hot and arid

• Wet and cloudy

• Cold and dark

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