Before handing out the worms. practice using magnifier; look at the lines on your finger.
Look more closely at worms and how their body structure helps them survive in their habitat.
Hand out one worm per student enclosed in a small petri dish with a film of water in the bottom.
Ask students to draw what they see (not what they think they see).
After a while, ask the students what they have noticed. Ask if they noticed the segments, how they move, the blood vessel, the dark soil in the gut, which is head and tail.
Allow more time for the drawing.
Show image of worm and relate to what students have found, and which body parts are similar and different to ours.
Head, tail, mouth, anus, segments, clitellum, blood vessel. Organs: heart, brain, blood vessels.
How do worms breathe?
We breathe by pulling air into our lungs. Worms breathe through their skin, by absorbing the oxygen from water - hence they need to stay moist to keep getting oxygen.
How do worms see? (There is no obvious eye).
Although we can't see any eyes on a worm, they do have rudimentary eyes. Eyes closed activity to show how worms see: ask students to look up at the light, then close their eyes and notice that they can still see some brightness. While keeping their eyes closed, face away from the light and notice how the light dims. Worms are able to detect where the light is with rudimentary eyes - they cannot focus to see an image but can detect which direction the light is coming from. This allows them to dig down into the soil (away from the light) to avoid predators.