Part A

Observing a Flatworm

1. CAUTION You will be working with a live animal. Be sure to treat it gently and to follow directions carefully. Use a medicine dropper to transfer one flatworm to a small culture dish. Gently cover the flatworm with water from the culture jar. Why should you use water from the culture jar instead of tap water?

2. Examine the flatworm under the low-power setting of the stereomicroscope. Notice the shape of its body. What kind of symmetry does it have? What structural features demonstrate this symmetry? Does the flatworm appear to have a distinct head and tail? How can you tell?

3. Observe how the flatworm moves. Look at the surface of the flatworm under high power. Can you see any structures that could account for its movement?

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