Dichotomous Keys.

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Presentation transcript:

Dichotomous Keys

Introduction A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. "Dichotomous" means "divided into two parts". Therefore, dichotomous keys always give two choices in each step.

Hints for Using Dichotomous Keys Always read both choices Be sure you understand the meaning of the terms used to describe the organisms. Do not guess. When measurements are given, use a calibrated scale. Do not guess. Study several specimen of living things to be sure your specimen is typical. If the choice is not clear, try both divisions. If you end up with two possible answers, read descriptions of the two choices to help you decide. Having arrived at an answer in a key, do not accept this as absolutely reliable. Check a description of the organism to see if it agrees with the unknown specimen.

Dichotomous key Example of a dichotomous key…

Dichotomous key the dichotomous key can also be expressed in a diagrammatic form

1. a. wings covered by an exoskeleton – go to step 2 b. wings freely observed – Go to step 3 2. a. body has a round shape ……….ladybug a red beetle with black spots b. body has an elongated shape ……….grasshopper a green insect that hops 3. a. wings point out from the side of the body ……….dragonfly an insect that is 10- 15 cm long and lives in marshes b. wings point to the posterior of the body ……….housefly a flying insect with red eyes and an annoying buzz