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You found five types of shells and two seed-like items that you need to identify for your collection. Identify the collection of items using the dichotomous key below and the photo key worksheet, where you will also be able to record your answers, on the next page. Use your observational skills!
Bookish Ways has an EXCELLENT starter pack of free, simple dichotomous key activity worksheets to help guide students if you don’t have the time to come up with your own.
A dichotomous key is an important scientific tool, used to identify different organisms, based the organism’s observable traits. Dichotomous keys consist of a series of statements with two choices in each step that will lead users to the correct identification.
Here are some activities you can use to teach dichotomous keys: 1. I begin by using a powerpoint that teaches students how dichotomous keys work. You can find it here. 2. Ready to practice? Here is a mollusk activity from Cornell.
A dichotomous, or branched, key is a device useful in classifying. Dichotomous (dy KAI-IT uh muhs) from the Greek word meaning "in two.' In a dichotomous key, two opposite characteristics are com- pared. As you use the key for classifying start with numbers la and lb.
MAKING A DICHOTOMOUS KEY. Example: Here are two examples of keys to show how to key out organisms, such as a kangaroo, a cow, a bee and a spider. Shown are a branching key and a numbered key. Pouch present (Kangaroo) Internal skeleton (Kangaroo, Cow) Animals to be keyed out Pouch absent (Cow) (Kangaroo, Cow, Bee and Spider) Six legs (Bee) No ...
Introduction: Dichotomous keys are written for small, specific groups of organisms. For example, each dichotomous key in this Gizmo is used to identify six to eight related species found within a geographic region. Goal: Identify a variety of organisms using dichotomous keys. 1.