![]() Examples of quantitative descriptions are such phrases as “has 10 striations on top surface,” “has 8 legs,” or “weighs 5 grams”. Examples of qualitative descriptions are such phrases as “contains green striations on top surface” or “feels slick on bottom surface.” Quantitative descriptions concern values that correspond with the item being classified. Qualitative descriptions concern the physical attributes, or qualities, of the item being classified. There are two kinds of descriptions that might be presented to the user of a dichotomous key: qualitative and quantitative descriptions. ![]() If the user makes the correct choice every time, the name of the organism will be revealed at the end. In each step, the user is presented with two statements based on characteristics of the organism. “Dichotomous” means “divided into two parts.” That is why dichotomous keys always give two choices in each step. Keys consist of a series of choices that lead the user to the correct name of a given item. It is the most widely used form of classification in the biological sciences because it offers the user a quick and easy way of identifying unknown organisms. ![]() The student will use a dichotomous key to identify seashells.Ī dichotomous key is a tool that allows the user to determine the identity of items and organisms in the natural world. The students will explore the benefits of creating and using dichotomous keys as a means of identifying an organism or object. Education on the Halfshell: Understanding a Dichotomous Key
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