The Locomotive Behavior of Earthworms Is Enabled by Contraction of Their

question 9

Multiple Choice

The locomotive behavior of earthworms is enabled by contraction of their longitudinal and circular muscles; this is seen through their typical burrowing behavior. Nematodes, however, contract their longitudinal muscles against the pressure of fluid in their bodies to produce a whiplike motion that enables them to move. Suppose you place an earthworm and a nematode in a watery solution. Which do you think would be able to move more easily, and why?

• A) the earthworm, because it uses two sets of muscles to help it move through the watery solution
• B) the nematode, because its whiplike motion will easily propel it through the watery solution
• C) the earthworm, because it can contract and expand its muscles to burrow down through the watery solution
• D) the nematode, because it can move its paddle-like appendages on its segments to help it move through the watery solution

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Definitions:

Identical

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