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STC Unit Descriptions
Microworlds
ISBN 0-89278-951-4
Subject: Introduction to lenses, microscopes, and
microorganisms
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Materials
included in the Microworlds unit kit.
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Students examine everyday objects as well as microorganisms with a
variety of magnifying devices. They begin by investigating several common objects with the
unaided eye. Using a variety of lenses, including hand lenses, acrylic spheres, and water
drops, they learn that a magnifying lens must be transparent and curved. Next, students
use a microscope to view inanimate objects. They learn proper focusing and lighting
techniques, as well as how to prepare slides. Students prepare a section of onion skin and
observe its cells. Students’ attention then turns to living specimens. Using a
microscope, they view three microorganisms—Volvox, Blepharisma, and the vinegar eel.
They study the cell structure of these organisms and observe how the organisms feed, grow,
and multiply. In a final challenge, students use the microscope to examine cultures they
have grown from hay and grass infusions.
Video download:
Microworlds
(Real Video™ or
QuickTime™)
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