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Study Guide Answers

1.     Define "ecosystem."
     interaction of a community of organisms with their environment
2.     What is the term for the three broad types of related biomes?
     biocores
3.     Where are tropical biomes predominantly located?
     predominantly in the lower latitudes, near the equator
4.     How are the boundaries within the tropics determined?
     by the amount and seasonal distribution of rainfall
5.     In terms of numbers of plant and animal species, the world's richest biome is found where?
     low-elevation, humid, tropical regions
6.     What is the term for the tropical rain forest biome?
     selva
7.     (True/False) Most soils in the humid tropics are infertile.
     true
8.     What are some distinguishing characteristics of a savanna's trees?
     characteristically low, umbrella-like shape
9.     How are ecosystems "fire-adapted"?
     most plants have extensive underground root systems
10.     (True/False) As a general rule, the higher the temperature, the greater the amount of moisture loss from plants and from their environments through evaporation.
     true
11.     Where are the middle latitude deserts usually found?
     rain shadows of high mountainsand deep continental interiors
12.     Describe the vegetation of middle latitude deserts.
     monotonous, small, widely-spaced shrubs
13.     What features of some plants enable them to reduce moisture loss?
     leathery leaves or leaves covered with fine hairs
14.     Where are temperate zone grasslands primarily found?
     subhumid, continental, interior regions
15.     What term is commonly used for semi-arid, temperate zone grasslands in any part of the world?
     steppe
16.     How do steppe grasses differ from prairie grasses?
     steppe grasses generally grow in bunches
17.     The Australian Zone is noted for its numerous species of what type of tree?
     eucalyptus
18.     The predominant trees in North America include _________________________ .
     oaks, maples, walnuts
19.     Which areas have proven to be highly attractive to agriculturalists?
     E. Asia, northwestern Europe, North America
20.     What is another term for the "taiga?"
     boreal forest
21.     List three things that can affect aquatic ecology.
     salinity, level of dissolved oxygen, mineral nutrien penetration of light
22.     (True/False) Temperature is a key factor in determining aquatic life zones.
     false
23.     List the three basic types of organisms in aquatic habitats.
     plankton, nekton, and benthos
24.     What are the very small, often microscopic organisms that are carried about by waves and currents ?
     plankton
25.     What are the larger, vigorously swimming organisms ?
     nekton
26.     What are "bottom dwellers" called?
     benthos
27.     (True/ False) Freshwater wetlands have often been considered to be wastelands.
     true
28.     A coastal body of water, where salty tidal waters from the ocean mix daily with fresh water flowing toward the sea, is called a(n) ________________________ .
     estuary
29.     Most life in oceanic waters is found in which zone?
     euphotic
30.     The aquatic life zones are among the most critical for the support of life in the terrestrial biomes because of _________________________ .
     the need for water
© Educational Video Network, Inc. 2005 - www.evndirect.com
Your leading source for curriculum-based educational videos and DVDs.