Question Of The Day

At 10:07 am
How do earthworms move?

Earthworms have tiny stiff hairs (setae) on almost every segment, and these little hairs help the earthworm move.  As earthworms stretch out and then contract their muscles the setae grab the soil and move the earthworm forward.

The setae are visible under a microscope and their position on the body is used for identification.  On larger earthworms the setae are so large that it makes the earthworm feel rough and bristly.  If you get some big earthworms, be sure to have students feel the setae.

15 thoughts on “How do earthworms move?
    1. First, last and clitellar segment lacks setae. The movement of the earthworm is neither positive geotropism nor negative geotropism. It exhibits positive geotaxis. It moves against the soil surface so this movement is called positive geotaxis.

          1. its called against the soil surface not the soil. And it is positive geotaxis as earthworm moves away from soil surface or towards geo centre( i.e, inside soil ).

  1. I am student of class 11 and I want to be preprad from now for mbbs but I lose my hope sometime and distract although I know u have to learn.

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