In this project, you will be creating a dichotomous key. Dichotomous keys are tools used by scientists to identify unknown organisms. Use the animals listed to create a dichotomous key. Decide upon a way to divide the items into two groups. Think of identifying characteristics such as shape, size, position, colour, texture, etc. Gram– Dichotomous Keys. Gram-negative rod Lactose + oxidase- Lactose - oxidase+ nitrate+ nitrate- Indole+ Escherichia coli Indole- Klebsiella pneumoniae Urease- H2S- Shigella dysenteriae motility- citrate- Glucose+ Pseudomonas Alcaligenes aeruginosa faecalis Other tests for oxidase positives: Glucose. What is a dichotomous key?. A biological device (tool) which enables one to identify an organism by progressively opting between two alternative observable characteristics Necessity of using a dichotomous key. used to identify organisms quickly and accurately. by following the statements in the key we are able to identify each organism on the basis of a characteristic which is not to. The best way to explain a dichotomous key is to see one. The chart to the right is a dichotomous key. The goal is to ask a series of questions where there is only 2 possible answers, and continue until you find your organism. For example in the image to the right. If we see a Duck but are unsure of its name, we can follow the chart.
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