Ecology Energy and Matter

Productivity in an ecosystem has to do with

• Efficiency of its primary consumers

• The number of different species living in the ecosystem

• Its longevity

• Its rate of producing biomass

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An ecosystem consists of

• A physical environment within which a biological community lives

• The species with which a biological community interacts

• A biological community and its physical environment

• the primary producers within a biological community

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The length and complexity of a food web in the Arctic would be ____ when compared to one in the tropical rainforest.

• shorter and less complex

• shorter and more complex

• longer and less complex

• longer and more complex

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Metabolism is a collective term for thousands of

• Organic compounds

• chemical reactions necessary for life

• molecules in a compound

• Cells in an organism

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The distinction between an organic compound and an inorganic compound is that organic compounds contain

• Oxygen

• Water

• Carbon

• Nitrogen

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Which of the following is not a molecule?

• O3

• O2

• H2O

• C6H12O6

• Na+

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The smallest particle that exhibits the characteristics of a chemical element is known as a(n)

• Molecule

• Atom

• Ion

• Compound

What implication does the law of conservation of matter have for humans?

• We cannot create energy because it is neither created or destroyed

• As matter is recycled it loses some of its integrity so we need to be careful when we dispose of goods

• Natural resources are unlimited because they are used and reused by living organisms

• Disposable goods are not going "away" when we throw them out

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Ecologists study....

• Living things and their genetic makeup

• Genetic Patterns and the chemistry in them

• The physical world and its processes

• Relationships between organisms and their environment

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Autotrophs

• use photosynthesis

• are able to survive without oxygen

• are primary consumers

• are at the top of the food chain

• cannot assimilate carbon

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