Describe the process of observing Spirogyra and preparing/observing a hay infusion for protozoans under a microscope.

This laboratory activity focuses on the Observation of Fresh Water Protozoans using a microscope. It involves two main parts: examining a prepared slide of Spirogyra and preparing a hay infusion to observe live protozoans.

• Part 1: Observing Spirogyra

  • Collect a fresh strand of Spirogyra from a pond or slow-flowing stream.
  • Place the Spirogyra on a clean slide and cover it with a cover slip.
  • Examine the slide under a microscope using the 4x objective (low power).

• Part 2: Preparing and Observing a Hay Infusion

  • Preparation: Collect some grass from a field and place it in a beaker. Add 100ml of tap water and boil the mixture. Allow it to cool for 12 hours. Then, add 100ml of pond water and let the entire mixture stand for 24 hours. This process creates a hay infusion, which encourages the growth of various protozoans.
  • Observation: After 24 hours, use a pipette to place a drop of the hay infusion solution onto a clean slide. Cover it with a cover slip.
  • Examine this preparation under a microscope using the 4x objective.
  • Identify and describe any Paramecium or Amoeba that you observe swimming in the solution.