Part D

Response to Gravity

8. With a wax pencil, draw a line around the middle of a test tube.

9. Fill the test tube almost full with water from the culture jar. Then use a medicine dropper to transfer one flatworm to the test tube. Seal the test tube with a stopper.

10. Hold the test tube horizontally and move it slowly back and forth until the flatworm is centered on the line you drew.

11. To test whether the flatworm can sense gravity, place the test tube vertically in the test-tube rack. Which way should the flatworm move to show a positive response to gravity? Observe the flatworm for several minutes. Use a stopwatch to measure the amount of time the flatworm spends above the line and below the line. Record the times in your data table.

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