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AP Biology Lab #2

This lab activity involves examining pond water and blood samples to study osmosis and cellular structures. First, prepare wet mounts of a drop of pond water and observe it under a microscope at low, medium, and high power. Sketch your findings at each magnification level. Next, prepare a wet mount of dilute blood, observing the cellular details in the same manner. Use the pulling stain technique with distilled water on the blood sample to observe osmosis effects on cells, and document your observations through sketches.

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AP Biology Lab #2

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  1. AP Biology Lab #2 Pond Water and Osmosis

  2. Pond Water Lab • Get one glass slide and one cover slip • Make a wet mount of a single drop of pond water • Examine the sample under the microscope • On low power, medium power and high power • Draw/sketch what you find (at each level)

  3. Osmosis Lab (Using Blood) • Get one glass slide and one cover slip • Make a wet mount of a single drop of dilute blood • Examine the sample under the microscope • On low power, medium power and high power • Sketch/draw what you can see at each power • Using the technique of Pulling a Stain, pull distilled water and observe its effects on the cells • Describe what you see and sketch observations

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