1 A) based on reproductive compatibility. B) based on branching relationships among species. C) based on evolutionary relationships. D) variable depending on the type of organism. 2 A) insects. B) bacteria. C) algae. D) mites, ticks, and spiders. 3 A) as a potential source of new kinds of foods. B) as an important source of new drugs and medicines. C) as the means by which important ecological processes can be preserved. D) for all the above reasons. 4 A) grow in the same tropical ecosystem. B) have been discovered by biologists in the last 25 years. C) are wild species providing us with important medicines. D) have exciting possibilities for use as human food. 5 A) is a relatively recent phenomenon. B) is linked exclusively to expanding human activities. C) has been the fate of the vast majority of species that have inhabited the earth. D) is characterized by more than one of the above. 6 A) vulnerable B) endangered C) threatened 7 A) bluefin tuna. B) orange roughy. C) sharks. D) all of the above. 8 A) broad categories of ecosystems. B) key species which are particularly important for normal ecosystem function. C) all species, regardless of their direct usefulness to humans. D) species providing commodities important to humans. 9 A) are all in danger of extinction in their native habitats. B) offer exciting prospects as potential sources of new drugs. C) are exotic species wreaking havoc in the ecosystems into which they have been introduced. D) offer promise as agents of biological control for pest species. 10 A) an indicator species B) an umbrella species C) a keystone species D) a flagship species 11 A) TRUE B) FALSE 12 A) TRUE B) FALSE 13 A) TRUE B) FALSE 14 A) TRUE B) FALSE 15 A) refers to the richness and complexity of a biological community B) is more important to conservation than genetic diversity C) refers to the various types of ecosystems on earth D) refers to the different kinds of species present in an ecosystem 16 A) Are determined based on number of endemics and habitat loss B) Account for less then 2% of the world’s land mass, yet comprise ¾ of the world's threatened animals C) Are found only in tropical ecosystems D) More than one of the above is true 17 A) Air purification B) Soil formation C) Nutrient cycling D) All of the above 18 A) TRUE B) FALSE 19 A) Flourish in a new environment due to a lack of predators, diseases or resource limitations. B) have been introduced both deliberately and accidentally C) Rarely invade islands because of their comparative isolation D) One of the above is false. 20 A) are especially interesting and attractive and are used by conservation organizations to motivate people. B) is a term that refers to the largest species of a community C) are species whose presence is tied to specific environmental conditions
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