Which Description Does Not Fit the Definition of an Ecosystem

question 200

Multiple Choice

Which description does not fit the definition of an ecosystem study?

• A) The transformation of energy through a group of forest-floor species
• B) The cycling of carbon through a group of soil bacteria on the forest floor
• C) Measurement of primary production by all producers in a large forest
• D) Atmospheric nitrogen fixation by plants in a forest environment
• E) Competitive and cooperative interactions among forest-floor beetle species

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Definitions:

Schwann Cells

A type of glial cell that myelinates the axons of the peripheral nervous system, enabling fast electrical impulses.

Nodes Of Ranvier

Gaps in the myelin sheath of axons that facilitate rapid signal transmission via saltatory conduction.

Hyperpolarization

A change in a cell's membrane potential, making it more negative, and thus further from initiating an action potential.

Inhibitory Postsynaptic Potential

A type of synaptic potential that makes a post-synaptic neuron less likely to generate an action potential, usually by making the inside of the neuron more negative.