Using a Dichotomous Key for Tree Identification

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

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

• 1
• 2
• 3
• 4

What is an organism? 

• a source of energy
• a organ-like structure
• a living thing
• a source of heat

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

• physical features
• weather patterns
• environment
• diet

Tags

NGSS.MS-LS4-2

Scientists classify organisms based on

• Taste

• Color

• Size

• Similarities and Differences

A dichotomous key for trees is provided. Hikers found a tree that has large brown cones and single sharp needles. What species of tree have the hikers found?

• Juniper
• Pine
• Spruce
• Fir

A botanist discovers a new plant in the jungle. Which of the

following observations of the plant’s characteristics would be useful in determining its identity with a dichotomous key?

• It was discovered in the summertime.

• It is wet from a recent rain storm.

• Its leaves curl up on the edges.

• It is eaten by native jungle ants.

Which one of the following characteristics would be useful in determining the identify of a tree in a dichotomous key?

• It provides shade.

• It has a nest.

• It has several birds in it.

• Its leaves are long and narrow.

What kind of tree?

• Eastern Hemlock

• Eastern White Pine

• Eastern Red Cedar

• American Holly

What kind of tree?

• Flowering Dogwood

• Black Walnut

• Eastern Redbud

• American Chestnut