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Trophic Levels in Ecosystems

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Questions and Answers

What is the primary reason for the limited energy available for higher trophic levels in an ecosystem?

Inefficient energy transfer

Energy lost as heat during metabolic processes

Energy used for growth, reproduction, and other life processes

All of the above (correct)

Which process is primarily carried out by certain bacteria in soil or in symbiotic relationships with plants?

Nitrogen fixation (correct)

Phosphorus cycling

Competitive exclusion

Mutualism

What is the term for the role or function of an organism within its ecosystem?

Trophic level

Ecological interaction

Niche (correct)

Habitat

What is the principle that states two species competing for the same limited resources cannot coexist indefinitely?

Competitive exclusion Signup and view all the answers

What is the term for the movement of phosphate ions through the lithosphere, hydrosphere, and biosphere?

Phosphorus cycling Signup and view all the answers

What is the result of changes in one population or species in an ecosystem?

Cascading effects throughout the ecosystem Signup and view all the answers

What is the primary function of trophic levels in an ecosystem?

To represent the transfer of energy and nutrients through an ecosystem Signup and view all the answers

What percentage of energy is transferred to the next trophic level?

10% Signup and view all the answers

What type of organism obtains organic molecules by consuming other organisms?

Heterotrophs Signup and view all the answers

What do ecological pyramids represent?

The distribution of energy, biomass, or numbers of organisms across trophic levels Signup and view all the answers

What is the primary difference between autotrophs and heterotrophs?

Their method of obtaining organic molecules Signup and view all the answers

What is the term for organisms that produce their own organic molecules from inorganic sources?

Autotrophs Signup and view all the answers