write an lab activity to see bacteria in pond water
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In this grade level, students' experiences with living things should expand to include the observation of microscopic organisms. During this time period, it is a good idea to let children have some experiences with increasing the scale of magnification.
In Pond 1: Pond Life, students explore how various organisms satisfy their needs within their environments and the kinds of relationships that exist between organisms within an environment.
In Pond 2: Life in a Drop of Pond Water, students observe microscopic organisms found in pond water using a hand lens, 30x magnification, and 100x magnification. Observing these organisms should stimulate discussions about how single-celled living things might satisfy their needs for food, water, and air. They can do this by comparing the needs of macroscopic organisms to those of microscopic ones. It is important to remember that while watching microorganisms is informative, it is not always likely that students will be able to observe these tiny cells performing such functions as dividing or taking in food. Thus direct observation should be supplemented with films of living cells or by using prepared materials.