About 350 years ago, a Dutch cloth merchant made tiny but powerful lenses and looked at a drop of rain water. He was amazed to see many tiny creatures moving about. Today, students in a school lab place a drop of pond water on a slide and observe it with a compound microscope fitted with a 10× eyepiece and a 10× objective. They see a slipper-shaped organism covered with tiny hair-like cilia, and some small green organisms with a whip-like tail.

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CASE_STUDIESHabitat of MicroorganismsCompound Microscope and Its PartsDiscovery of Microorganisms by Antoni van Leeuwenhoek3 sub-questions