Dichotomous Key

Dichotomous Key

Multiple Choice

Which leaf is shown in the drawing?

• Magnolia

• Redbud

• Sweetgum

• None of the above

Multiple Choice

Which letter in the picture has two pairs of wings?

• M

• K

• F

• L

Multiple Choice

A student discovers an arachnid with a segmented abdomen, long legs, and a tail with no stinger.

The student uses the dichotomous key below to identify it.

1. a) Abdomen segmented.............go to 2

b) Abdomen not segmented ......go to 4

2. a) Abdomen with tail....................go to 3

b) Abdomen without tail...............go to 5

3. a) Tail with stinger..........................Scorpion

b) Tail without stinger.....................Whip scorpion

4. a) Legs longer than body.............Daddy Long Legs

b) Legs not longer than body……….Wind scorpion

5. a) Covered with spines .......................Mite

b) Few spines.....................................Tick

• Whip Scorpion

• Daddy Long Legs

• Mite

• Tick

Multiple Choice

Identify the plant shown

• A

• B

• C

• D

Multiple Choice

Identify leaf F

• Cydonia

• Magnolia

• Aesculus

• Fraxinus

• Ilex

Multiple Choice

Why do scientists use dichotomous keys?

• To arrange organisms based on habitat

• To determine evolutionary history

• To identify different organisms

• To analyse feeding habits

Multiple Choice

How many options should every branch in a dichotomous key have?

• 1

• 2

• 3

• 4

Multiple Choice

When using a dichotomous key to identify organisms, what do we look at?

• physical features

• weather patterns

• environment

• diet

Multiple Choice

What step do we always start with when using dichotomous keys?

• 1

• 2

• 3

• 4

Multiple Choice

What is the purpose of a dichotomous key?

• to find a common ancestor

• to show the evolution of organisms

• to show relationships between organisms

• to identify organisms