Warm-Up Identifying Unknown Organisms

Warm-Up Identifying Unknown Organisms

Lesson Objectives

By the end of this lesson, you should be able to:

? Describe the purpose for using a

key.

? Explain the process of

an organism using a

dichotomous key.

Science Practice: Distinguish between and give examples of and inference.

W2K

Words to Know

Fill in this table as you work through the lesson. You may also use the glossary to

help you.

dichotomous key

a series of organisms

between alternate that is used to

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Warm-Up Identifying Unknown Organisms

Classification of Organisms

is the science of naming and classifying organisms based on structural comparisons and genetic evidence. Fill in the blanks in the diagram.

Kingdom Phylum

Order Family

Species

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Instruction Identifying Unknown Organisms

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Lesson

Question

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Importance of Identifying Organisms

Organisms are identified to:

? satisfy

.

?

organisms.

? identify

.

? study

.

? understand how

interact.

4

Dichotomous Keys

A

is a series of choices between alternate

characteristics that is used to identify organisms.

? It is based on easily organisms.

characteristics of known

? Each step usually has

choices.

? Each choice can be answered "

" or "No."

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Instruction Identifying Unknown Organisms

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Observations

of organisms include:

? color, shape, size, and

(scaly, furry).

? number,

, and arrangement of parts.

? sounds.

? diet,

, and behaviors.

Inferences

are logical

made from observations.

When you

an animal, you are doing it based on ; but understand, the final identification will be an based on the evidence you have.

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Instruction Identifying Unknown Organisms

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How to Use a Dichotomous Key

STRATEGY

Circle the correct choice in Step 1 for a lake fish with a single dorsal fin.

Lake fish

Step 1: Single dorsal fin

Y/N

Step 2

Step 2

Step 1: Double dorsal fin

Y/N

Step 4

Step 4

How to Use a Dichotomous Key

EXAMPLE Circle the correct choices in questions 1 and 5 for a catfish.

1. (a) Has a single dorsal fin 5 (b) Has a double dorsal fin 2

5. (a) Has small fin on back near tail 6 (b) Has no fin on back near tail 7

6. (a) Has barbs near the mouth Catfish (b) Does not have barbs near the mouth 10

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