1. VOCABULARY:
Classification
Dichotomous Key

4. You will be able to explain why classification systems are important.
Objectives:
You will be able to explain why classification systems are important.
You will be able to demonstrate your understanding with a dichotomous key.

5. Question:
Why do we classify things (like at the shoe store or the grocery store)?
To make things easier!

6. Question:
Why do scientists classify things?
TO MAKE THINGS EASIER

7. Dichotomous Key
Is a system used by scientists to CLASSIFY unknown organisms by examining the characteristics of the organism and then determining to which group that unknown organism should be placed based upon those characteristics.

8. It is also utilized as a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. Keys consist of a series of choices that lead the user to the correct name of a given item. "Dichotomous" means "divided into two parts

10. Divides a larger group in smaller groups
Dichotomous Key
Divides a larger group in smaller groups
Typically, it may separate objects into groups that “have it” and those that “don’t have it”

11. Look at these Pictures

12. What do they have in
Common?

13. Copy this diagram

14. Dichotomous Key of Transportation Vehicles
Vehicles with wheels:

15. Dichotomous Key of Transportation Vehicles
Vehicles with wheels:
Canoe, boat, sailboat,
Unicycle, skates, a/p, bike, train, car, bus

16. Dichotomous Key of Transportation Vehicles
Vehicles with wheels:
Unicycle, skates, ap, bike, train, car, bus
Canoe, boat, sailboat,
Wheels made of rubber/plastic:

17. Dichotomous Key of Transportation Vehicles
Vehicles with wheels:
Unicycle, skates, ap, bike, train, car, bus
Canoe, boat, sailboat,
Wheels made of rubber/plastic:
Unicycle, skates, ap bike, car, bus
train

18. Dichotomous Key of Transportation Vehicles
Vehicles with wheels:
Unicycle, skates, ap bike, train, car, bus
Canoe, boat, sailboat,
Wheels made of rubber/plastic:
Unicycle, skates, ap bike, car, bus
train
Carries over 10 people:

19. Dichotomous Key of Transportation Vehicles
Vehicles with wheels:
Unicycle, skates, bike, train, car, bus
Canoe, boat, sailboat,
Wheels made of rubber/plastic:
Unicycle, skates, bike, car, bus
train
Carries over 10 people:
Bus, ap
Unicycle, skates bike, car

20. What are These?

21. Animals

22. Dichotomous Key of Animals
Animals with 4 legs

23. Dichotomous Key of Animals
Animals with 4 legs:
Ostrich, worm, shark, man, rooster
Horse, gorilla, cow

24. Ostrich, worm, shark, man, rooster
Dichotomous Key of Animals
Animals with 4 legs :
Horse, gorilla, cow
Ostrich, worm, shark, man, rooster
Animals with tail:

25. Ostrich, worm, shark, man, rooster
Dichotomous Key of Animals
Animals with 4 legs:
Horse, gorilla, cow
Ostrich, worm, shark, man, rooster
Animals with tail:
Horse, cow
gorilla

26. Ostrich, worm, shark, man, rooster
Dichotomous Key of Animals
Animals with 4 legs:
Horse, gorilla, cow
Ostrich, worm, shark, man, rooster
Animals with a tail:
Horse, cow
gorilla
Animals with utters:

27. Dichotomous Key of Animals
Animals with 4 legs:
Horse, gorilla, cow
Ostrich, worm,
shark, man, rooster
Animals with a tail:
Horse, cow
gorilla
Animals with utters:
cow
horse

28. Tips for Classifying
Carefully observe objects to “notice” similarities and differences
Place objects into either one group or another – not both groups
Examine each group you create – to see if it can be further subdivided

29. Class Activity