Dichotomous Keys

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

• 3 Paris of walking legs on both sides

• Two propodus

• 3 Chelipeds

• A pair of eyes

What is the correct classification for the pictured organism?

• 
• Insecta

• Scorpiones

• Araneae

• Amblypygi

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.

1. a) Abdomen segmented.............go to 2

b) Abdomen not segmented ......go to 4

2. a) Abdomen with tail....................go to 3

b) Abdomen without tail...............go to 5

3. a) Tail with stinger..........................Scorpion

b) Tail without stinger.....................Whip scorpion

4. a) Legs longer than body.............Daddy Long Legs

b) Legs not longer than body……….Wind scorpion

5. a) Covered with spines .......................Mite

b) Few spines.....................................Tick

• Whip Scorpion

• Daddy Long Legs

• Mite

• Tick

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

• Diptera

• Lepidoptera

• Heteroptera

• 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 very broad wings

• It likes only certain plants

• Its wings beat very fast in hot weather

You found a cone that was large with needles in groups of 2 or more, what did you find?

• Juniper

• Pine

• Spruce

• Fir

Which letter in the picture has two pairs of wings?

• M

• K

• F

• L

What class is the picture of?

• 
• Arachinda

• Crustacea

• Centipede

• Insecta

Which of the following is most helpful for identifying an organism using a dichotomous key?

• Where it lives

• Lifespan

• Its physical structures

• What it eats

Tags

NGSS.MS-LS4-2

Which leaf is shown in the drawing?

• Magnolia

• Redbud

• Sweetgum

• None of the above