![]() Pictures should be diverse and have evident easily seen characteristics. Pictures can be projected on a smart board or overhead projector, or magnets can be placed on the back of pictures for placement on the blackboard. The instructor will find ten pictures of different plants and animals that depict the complete body of the organism rather than a partial or face shot. I can construct and use a dichotomous key based on different organisms’ characteristics.ģ0-60 minutes to review activity, collect materials, and make copies Extension: 1-2 hours to collect materials How do you use a dichotomous key and why is a dichotomous key important? What types of characteristics can be used to identify an organism? ![]() How can you identify an unknown organism? ![]() To use a dichotomous key, one must be able to make accurate observations and follow directions carefully. A dichotomous key provides users with a series of statements with two choices that will eventually lead to the correct identification of the organism. Dichotomous literally means dividing into two parts (Merriam-Webster, 2014). Most such keys are created in a dichotomous format. Classification keys are tools that provide a means to correctly identify different organisms, based on observable traits. Scientists have catalogued 1.5 million species on Earth and estimate that there might be as many as 100 million more unidentified species (Giller, 2014). Dichotomous keys consist of a series of statements with two choices in each step that will lead users to the correct identification. Grade Level: Middle School: Sixth Grade through Eighth Grade Subject: Science Lesson Duration: 60 Minutes Common Core Standards: 6-8.RST.1, 6-8.WHST.2, 6-8.WHST.9, 8.SL.1, 8.SL.4, 6.EE.6, 6-8.RST.7 Additional Standards: MS-LS4-2, MS-Ls4-1 ObjectiveĪ dichotomous key is an important scientific tool, used to identify different organisms, based the organism’s observable traits.
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