Dichotomous Keys.

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Direct Instruction: Dichotomous Keys

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Presentation transcript:

Dichotomous Keys

Dichotomous Keys A dichotomous key is a tool that allows the user to determine the identity of items in the natural world based on the items characteristics "Dichotomous" means “divided into two parts” Greek origin dichotomous keys always give two distinct choices in each step, often they are opposites Black/white; good/evil; pointed/rounded

How to use a Dichotomous Key? Here are creatures we don’t know! Lets choose one

How to use a Dichotomous Key? Choose only one creature at a time.

How to use a Dichotomous Key? Read steps 1a and 1b Decide which statement is true 1b is true

How to use a Dichotomous Key? Then follow the directions after that step. Go to step 5!

How to use a Dichotomous Key? At choice 5, you make another dichotomous choice 5a is true Go to step 6!

How to use a Dichotomous Key? Keep going until you come to a step that gives you the creature’s name 6 a. The creature has one antennae Go to Step 7. C C

How to use a Dichotomous Key? Choose a new creature and start at step 1a and 1b again. Continue until you find the creature’s name. C Where do you start again?

Then, find the names of all the creatures y

Dichotomous key Another Example of a dichotomous key…

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