Dichotomous Keys

What is the purpose of a dichotomous key?

• to find a common ancestor
• to show the evolution of organisms
• to see what organisms eat
• to identify organisms

Take your time and read carefully! Timer is 3 minutes!
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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

The 8 levels of classification, most broad to most specific. (From largest to smallest)

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

The first part of a scientific name is an organism's _______________ and the second part is its ________________.

• species, genus
• phylum, order
• class, spices
• genus, species

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

• physical features
• weather patterns
• environment
• diet

Tags

NGSS.MS-LS4-2

Take your time and read carefully! Timer is 3 minutes!
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An illustration and a dichotomous key are given. What is the correct classification for this organism?

• Class Insecta
• Order Amblygygi
• Order Araneae
• Order Scorpiones

Tags

NGSS.MS-LS4-2

Take your time and read carefully! Timer is 3 minutes!
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A dichotomous key for insects is given. To what order does an insect with two pairs of scaly wings belong?

• Coleoptera
• Heteroptera
• Diptera
• Lepidoptera

Take your time and read carefully! Timer is 3 minutes!
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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. Which arachnid has the student found?

• Whip Scorpion
• Wind Scorpion
• Tick
• Scorpion

Tags

NGSS.MS-LS4-2

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

• Step 1
• Step 2
• Step 3
• Step 4

Tool used by a taxonomist to identify an unknown organism is a:

• dichotomous key
• binomial nomenclature
• scientific name
• binomial key