List the three major trophic categories in a food web. What types of organisms are found in each level? Where are the autotrophs and heterotrophs found in a food web? Discuss the significance of each level for the integral functioning of the food web
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The three major trophic categories are producer, consumer, and decomposer. Producers include green plants and chemo- and photosynthetic bacteria. All organisms are autotrophs in this level. The next category, consumers, includes herbivores as primary consumers and carnivores as secondary and tertiary consumers. All organisms at this level are heterotrophs. The final category is the decomposers, which include bacteria, and fungi and a few other microorganisms. These are all heterotrophs. Producers are important because they provide the energetic and material basis for consumption of all other levels. The decomposers' role is to aid in soil production and fertility and they recycle nutrients to the producers. The consumers are a very significant force in regulating populations of plants and prey animals. They also are important as pollinators and dispersers of plant species.
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From an environmental standpoint, refusing, reducing, and reusing are preferred over recycling because they are ____ approaches that tackle the problem of waste production at the front end.
A. waste prevention B. integrated C. management D. green E. more feasible
Growing sugar beets for sugar, as an alternative to importing sugar made from sugar cane, is an example of
A) import substitution. B) a quaternary sector activity. C) flexible production. D) vertical disintegration. E) deindustrialization.
Which of the following has the greatest number of nonbonding pairs of electrons?
A) C B) H C) He D) F E) S
True or False: Mantle convection occurs because upward-moving rock expands more by decompression than it contracts by cooling
Indicate whether this statement is true or false.