Dichotomous key

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

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

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

• 1
• 2
• 3
• 4

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

• physical features
• weather patterns
• environment
• diet

The 8 levels of classification, most broad to most specific.

• Domain, Genus, Family, Order, Class, Phylum, Kingdom, Species
• Domain, Species, Kingdom, Genus, Phylum, Family, Class, Order
• Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species
• Order, Kingdom, Species, Domain, Phylum, Family, Class, Genus

Tags

NGSS.MS-LS4-2

NGSS.MS-LS4-1

Term given to describe the 2 name naming system is:

• dichotmous key
• binomial nomenclature
• 2 scientific names
• binomial key

Butterflies usually are identified by the colors and patterns on their wings. Butterflies have four wings: The two wings near the butterfly’s head are “forewings” while the wings near the butterfly’s tail are “hindwings.” You can use the following dichotomous key to identify four common butterfly species in North America.

Based on the key, what species of butterfly is shown below?

• Papilio glaucus

• Papilio polyxenes

• Danaus plexippus

• Colias philodice

Tags

NGSS.MS-LS4-2

Based on the same dichotomous key, what is the butterfly shown below?

• Papilio glaucus

• Papilio polyxenes

• Danaus plexippus

• Colias philodice

Tags

NGSS.MS-LS4-2

A student creates a dichotomous key to identify common household pets. What is wrong with this key?

• Hamsters have hairy bodies.

• Goldfish don't live in cages.

• A pet can have a hairy body and live in a cage, or can be hairless and not live in a cage.

• All of the above.

Tags

NGSS.MS-ETS1-1

Suppose you were making a dichotomous key to identify the three types of leaves shown below. Which of the following traits could you use to classify these leaves into separate groups?

• Presence or absence of veins in the leaves.

• Presence or absence of stems.

• How leaves are arranged on branches.

• Size of leaves.