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Biology LibreTexts

13.1: Learning Objectives

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  • Learning Objectives

    After this lab you should be able to:

    1. Define osmosis, hypertonic, hypotonic, and isotonic.
    2. Analyze scenarios with regard to net water movement in and out of a cell and discuss the effect of osmotic pressure on microorganisms.
    3. Classify organisms based on their salinity preferences.

    Gather the family/friends/roommates around and try this at home:

    Place a piece of lettuce in a bowl of super salty water. Let is sit for a half hour or so. Prediction? Observations? Next, place the same piece of lettuce in a bowl of plain tap water. Let it sit again—this may take a bit longer. Prediction? Observations?

    Try to explain what happened, or (should you be out of lettuce) what you think would happen.

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