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Exam 20: Terrestrial Biomes

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Question 61

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Which of the following best describes an invasive species?

A) An invasive species is any non-native introduced species, whether it becomes established or not.
B) Non-native species become invasive when they become established in a new area, taking over niches that were already occupied by native species.
C) Dispersal, even if anthropogenic, is a normal biogeographic process and, therefore, no cause of alarm.
D) Approximately 90% of all introduced non-native species become invasive species.

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Question 62

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Trees and shrubs that seasonally loose their leaves are called

A) evergreens.
B) annual herbs.
C) deciduous.
D) bryophytes.

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Question 63

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Discuss the concept of the biome, including the various factors used to characterize one.

This biome consists of large expanses of xerophytic grassland and scattered trees and shrubs adapted to drought, grazing by large herbivores, and fire.

The largest areas of tropical savanna occur in South America, particularly in Venezuela.

"Wallace's line," which serves as a dividing line between different biogeographic realms and separates several present-day Indonesian islands from one another, is so named to show the arbitrary nature of such delineations.

The climate of the tropical rain forest biome is best described as

The soils of the boreal forest acidic and leached of humus and clays, belonging to the ________ soil order.

Invasive species represent a threat to biodiversity worldwide. Based on either the examples presented in the textbook or outside sources, describe several invasive species of concern in your area. What factors contributed to their spread. Why are these species of concern, both in a broad context, as well as within your area.

Biomes are defined based on idealized potential mature vegetation in a given area rather than the actual vegetation.

Which of the following is not an anthropogenic biome?

The Earth's largest living organism in terms of biomass is the

Discuss the extent of deforestation in the tropics and why it is such an important environmental issue.

Fire is an important maintenance factor in the tropical savanna and midlatitude grasslands biomes.

Midlatitude grasslands are found only in North America.

This biome occurs in equatorial regions with erratic rainfall and typically occur on the margins of tropic rainforests.

This biome occupies more than one-third of the Earth's land area and is characterized by xerophytic vegetation, low precipitation, and high potential evapotranspiration.

Home to the endangered Northern Spotted Owl (Strix occidentalis caurina) , this biome is now characterized by anthropogenic disturbance and mostly secondary-growth forest.