Dichotomous Key Review

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

Which of the following characteristics will most likely be helpful in identifying a butterfly using a dichotomous key?

• migrates north every spring

• hangs on branches

• flutters wings on hot days

• wings have long extensions

A dichotomous key for insects is given. To what order does an insect with two pairs of scaly wings belong?

• Coleoptera

• Heteroptera

• Diptera

• Lepidoptera

A student discovers an arachnid with a segmented abdomen, long legs, and a tail with no stinger. The student uses the dichotomous keys below to identify it. Which arachnid has the student found?

• Whip Scorpion

• Wind Scorpion

• Daddy long legs

• Scorpion

An illustration and a dichotomous key are given. What is the correct classification for this organism?

• Class Insecta

• Order Amblypygi

• Order Araneae

• Order Scorpiones

A labeled diagram of a fiddler crab is provided. Which of the following is an accurate observation of the structures of a fiddler crab? Fiddler crabs have...

• eight pairs of walking legs on each side.

• an enlarged propodus on both front legs.

• a pair of eyes on stalks at the top of the body.

• one cheliped used for grasping.

A table of arachnid and insect characteristics is shown. Which characteristic could be used to distinguish between arachnids and insects?

• jointed legs

• body segments

• presence of eyes

• presence of antennae

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

• 1

• 2

• 3

• 4

List the levels of organization from broad to most specific.

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

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

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

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

Which is not a rule for writing the scientific name of an organism? Select all that apply.

• Genus and species are capitalized.

• Genus is capital and species is lower case.

• Genus and species are italicized.

• Family is capital and species is lower case.