This experiment was conducted to determine food preference of planaria. Planaria are freshwater creatures. They live in lakes, streams, and other freshwater bodies.

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Design

Introduction

        This experiment was conducted to determine food preference of planaria. Planaria are freshwater creatures. They live in lakes, streams, and other freshwater bodies. Planaria are non-parasitic and eat decaying meat.

        In the following experiment, planaria will be placed in five difference choice chambers, each with a different type of food. After fifteen minutes, the planaria’s distance from the food will be measured in centimeters and recorded.

Variables

        Independent Variable

                Type of food

        Dependent Variable

                Distance from food after fifteen minutes

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        Controls

                Distance of planaria from chamber in which they were not placed

Constants

        Amount of water in each choice chamber

        Temperature of water

        Environment

Materials

        Five choice chambers

        500 mL of room temperature, distilled water

        200 mL beaker

        Pipet

        20 planaria

        Apple

        Liver

        Aquatic plant

        Potato

        Ruler

        Timer

Procedure

  1. Gather materials.
  2. Label the choice chambers A, B, C, D, and E
  3. Fill all of the choice chambers with 100mL of water
  4. Place on type of food in each of the choice chambers, completely in one of the chambers (excluding the last choice chamber, which ...

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