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Making a Dichotomous Key

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Presentation on theme: "Making a Dichotomous Key"— Presentation transcript:

1 Making a Dichotomous Key

2 Making a Dichotomous Key
In order to classify things, consider your original grouping: Tea Popcorn Lemonade Cheese Coffee Rice Fanta Yogurt Milk

3 Making a Dichotomous Key
Try to group them into 2 groups (remember, di = 2!) Tea Lemonade Coffee Fanta Milk Popcorn Cheese Rice Yogurt

4 Making a Dichotomous Key
You’ve created your first dichotomy! Common Foods & Drinks Tea Lemonade Coffee Fanta Milk Popcorn Cheese Rice Yogurt

5 Making a Dichotomous Key
Now keep dividing into two groups, each time… Common Foods & Drinks Consumed Cold: Lemonade Fanta Milk Consumed Warm: Tea Coffee Grains: Popcorn Rice Dairy: Cheese Yogurt

6 Making a Dichotomous Key
…keep going, creating more dichotomies… Common Foods & Drinks Consumed Cold: Lemonade Fanta Milk Consumed Warm: Tea Coffee Grains: Popcorn Rice Dairy: Cheese Yogurt Generally savoury: Cheese Citrus: Lemonade Fanta Often sweet: Yogurt Non-Citrus: Milk lemon? Tea No lemon? Coffee “popped” Popcorn steamed Rice

7 Making a Dichotomous Key
… until each item is in its own distinct category. Voila! Common Foods & Drinks Consumed Cold: Lemonade Fanta Milk Consumed Warm: Tea Coffee Grains: Popcorn Rice Dairy: Cheese Yogurt Generally savoury: Cheese Citrus: Lemonade Fanta Often sweet: Yogurt Non-Citrus: Milk lemon? Tea No lemon? Coffee “popped” Popcorn steamed Rice Carbonated: Fanta Not carbonated: Lemonade

8 Making a Dichotomous Key
You know you’ve done it right if you can read it backwards and get a description of the item: Yogurt is an often sweet dairy food! Common Foods & Drinks Consumed Cold: Lemonade Fanta Milk Consumed Warm: Tea Coffee Grains: Popcorn Rice Dairy: Cheese Yogurt Generally savoury: Cheese Citrus: Lemonade Fanta Often sweet: Yogurt Non-Citrus: Milk lemon? Tea No lemon? Coffee “popped” Popcorn steamed Rice Fanta is a carbonated citrus cold drink! Carbonated: Fanta Not carbonated: Lemonade

9 Now, try it! Create a dichotomous key of Coins:

10 Try it again! Let’s sort these Ungulates!

11 One more! Spicy, spicy peppers! Classify ‘em!

12 Other formats: This type of ‘checklist’ key is often found in field guides since it is more compact

13 Now you know! And…


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