Chapter 3 The Biosphere

The lowest level of environmental complexity that includes living and nonliving factors is

• biome
• community
• ecosystem
• biosphere

Which ecological inquiry method is an ecologist using when he or she enters an area periodically to count the population numbers of a certain species?

• Questioning
• observing
• experimenting
• modeling

A mathematical formula designed to predict population fluctuations in a community could be called a(n)

• biological experiment
• biological system
• ecological model
• ecological observation

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How do most primary producers make their own food?

• by using light energy to make carbohydrates
• by using chemical energy to make carbohydrates
• by changing water into carbon dioxide
• by breaking down remains to make carbon dioxide

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Compared to land, the open oceans

• have less zooplankton
• contain unlimited nitrogen
• are nutrient-poor environments
• are rich in silica and iron

All the interconnected feeding relationships in an ecosystem make up a food

• interaction
• chain
• network
• web

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The total amount of living tissue within a given trophic level is called the

• organic mass
• trophic mass
• energy mass
• biomass

What animals eat both producers and consumers?

• herbivores
• omnivores
• chemotrophs
• autotrophs

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A bird stalks, kills, and then eats an insect. Based on its behavior, which pair of ecological terms describes the bird?

• herbivore,decomposer
• producer, heterotroph
• carnivore,consumer
• autotroph, herbivore

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Carbon cycles through the biosphere in all of the following processes EXCEPT

• photosynthesis
• transipration
• burning fossil fuels
• decomposition of plants and animals

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