WorksheetsDichotomous key
Total questions: 20
Worksheet time: 15mins
What is the purpose of a dichotomous key?
to find a common ancestor
to show relationships between organisms
to show the evolution of organisms
to classify organisms
From the table, which two animals are MOST CLOSELY related
House Cate and Red Fox
Dog and Wolf
Red Fox and Dog
Wolf and Gopher
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
When using a dichotomous key to identify organisms, what do we look at?
diet
weather patterns
environment
physical features
The first part of a scientific name is an organism's _______________ and the second part is its ________________.
species, genus
class, spices
phylum, order
genus, species
An illustration and a dichotomous key are given. What is the correct classification for this organism?
Class Insecta
Order Araneae
Order Amblygygi
Order Scorpiones
A table of arachnid and insect characteristics is shown. Which characteristic could be used to distinguish between
arachnids and insects?
Jointed legs
Presence of eyes
Body segments
Presence of antennae
What is the name of bird W?
Certhidea
Geospiza
Camarhynchus
Platyspiza
A dichotomous key for insects is given. To what order does an insect with two pairs of scaly wings belong?
Coleoptera
Diptera
Heteroptera
Lepidoptera
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
Its leaves curl up on the edges.
It is wet from a recent rain storm.
It is eaten by native jungle ants.
A student discovers an arachnid without a segmented abdomen, and legs longer than its body. The student uses the dichotomous key below to identify it. Which arachnid has the student found?
Whip Scorpion
Daddy long legs
Wind Scorpion
Scorpion
Which of the following is an accurate description of the fiddler crab?
3 Pairs of walking legs on both sides
Two propodus
3 Chelipeds
A pair of eyes
A student discovers an arachnid with a segmented abdomen, long legs, and a tail with no stinger.
Whip Scorpion
Mite
Daddy Long Legs
Tick
To what order does a two pairs of wings, rigid and leathery and mouth for sucking belong to?
Diptera
Heteroptera
Lepidoptera
Coleoptera
Which of the following characteristics will most likely be helpful in identifying a butterfly using a dichotomous key?
It migrates north in the summer
It has long tail
It likes only certain plants
Its wings beat very fast in hot weather
Which letter in the picture has two pairs of wings?
M
F
K
L
Which leaf is shown in the drawing?
Magnolia
Sweetgum
Redbud
Pine
Which of the paired statements could be used to tell the difference between the two insects using a dichotomous key?
Has 6 legs
Has 8 legs
Large hind legs
Small hind legs
2 pairs of spots on wing cover
3 pairs of spots on wing cover
Antennae absent
Antennae present
Which 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
Which shark is the picture of?
Cow Shark
Great White Shark
Hammerhead Shark
Saw Shark
