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STAAR TUTORIAL Dichotamus Key

Total questions: 20

Worksheet time: 25mins

Name
Class
Date
1.
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?
a)
It was discovered in the summertime
b)
It is wet from a recent rain storm.
c)
Its leaves curl up on the edges.
d)
It is eaten by native jungle ants.
2.
When using a dichotomous key to identify organisms, what do we look at?
a)
physical features
b)
weather patterns
c)
environment
d)
diet
3.
What is a dichotomous key used for in science?
a)
To organize biomes
b)
Classify organisms
c)
Identify bacteria only
d)
None of these
4.
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?
a)
Whip Scorpion
b)
Wind Scorpion
c)
Daddy long legs
d)
Scorpion
5.
Using this dichotomous key, identify the name of the circled Fish, J.
a)
peacock flounder
b)
band-tail puffer
c)
trumpet fish
d)
spotted goat fish
6.
A dichotomous key for insects is given. To what order does an insect with two pairs of scaly wings belong?
a)
Coleoptera
b)
Heteroptera
c)
Diptera
d)
Lepidoptera
7.
What is the name of bird W?
a)
Certhidea
b)
Geospiza
c)
Camarhynchus
d)
Platyspiza
8.

Which of the following is an accurate description of the fiddler crab?

a)

3 Paris of walking legs on both sides

b)

Two propodus

c)

3 Chelipeds

d)

A pair of eyes

9.

Which letter in the picture has two pairs of wings?

a)

M

b)

K

c)

F

d)

L

10.

Is this insect segmented?

a)

Yes

b)

No

11.

What does the word "segment" mean?

a)

Smaller pieces

b)

Only one piece

12.

Simple or Compound Leaf?

a)

Simple

b)

Compound

13.

Simple or Compound Leaf?

a)

Simple

b)

Compound

14.

Alternate or Opposite?

a)

Alternate

b)

Opposite

15.

Alternate or Opposite?

a)

Opposite

b)

Alternate

16.

What is the correct classification for the pictured organism?

a)
b)

Insecta

c)

Scorpiones

d)

Araneae

e)

Amblypygi

17.

To what order does a two pairs of wings, rigid and leathery and mouth for sucking belong to?

a)

Diptera

b)

Lepidoptera

c)

Heteroptera

d)

Coleoptera

18.
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?
a)
Juniper
b)
Pine
c)
Spruce
d)
Fir
19.
What step do we always start with when using dichotomous keys?
a)
1
b)
2
c)
3
d)
4
20.

This classification scheme indicates that the house cat is most closely related to the

a)

dolphin

b)

songbird

c)

lynx

d)

wolf

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