You Experiment with a Live Earthworm and Notice the Following

question 40

Multiple Choice

You experiment with a live earthworm and notice the following results: - With an intact earthworm,when you "poke" a segment,it contracts.- When you cut off the first segments containing the brain,the remaining worm still crawls.- When you cut the nerve in each septal wall,contractions continue.- If you cut the body wall,leaving the nerve cord intact,crawling still continues.- When you cut both the body wall nerve and the nerve cord,there are no longer any coordinated contractions.What is a reasonable conclusion?

• A)An earthworm's brain controls crawling.
• B)The ventral nerve cord controls all contractions.
• C)Mechanical stimulation of each segment triggers contractions.
• D)Earthworms use ventral nerve cord to coordinate contractions along the length of the worm and mechanical stimulation of each segment to triggers segmental responses during crawling.
• E)None of the choices is correct.

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