Science | Graded Assignment |
Graded Assignment
Lab Report
Create a dichotomous key that identifies the 10 leaves on the Common Leaves sheet. Look closely at those leaf samples and devise a dichotomous key that helps you identify them. Be sure that your dichotomous key contains only pairs of statements about a single characteristic. For example, a pair of statements might be:
A. leaf margin smooth
B. leaf margin toothed
However, you should avoid pairs of statements that do not address the same characteristic. The following pair, for example, would not be very informative in your key:
A. leaf margin smooth
B. leaf type needle-like
As you develop your key, test it out with the 10 leaves provided on the Common Leaves sheet. When you've developed a key that identifies all 10 leaves, type your statements, “go tos,” and identifications, following the format in the example below. The example is based on this lesson’s dichotomous key for birds.
Statement
Types/Dichotomous key for birds
Identification
Name/Number of Leaves
Statement 2a
The bird has a crest of feathers on the top of its head.
go to statement or identify bird
blue jay
Statement 2b
The bird has a smooth head.
go to statement or identify bird
3
Once you have completed your dichotomous key, answer the two remaining questions. When you are finished, submit this assignment to your teacher by the due date for full credit.
Total score: Click or tap here to enter text. of 26 points
(Score for Question 1: Click or tap here to enter text. of 20 points)
1. Complete a dichotomous key for the 10 leaves on the Common Leaves sheet. The chart provided here allows for 11 pairs of statements. Depending on how you build your dichotomous key, you may or may not need all of them, or you may need to add some.
Statement
Types/Dichotomous key for leaves
Identification
Name/Number of Leaves
Statement 1a
go to statement or identify leaf
Statement 1b
go to statement or identify leaf
Statement
Types/Dichotomous key for leaves
Identification
Name/Number of Leaves
Statement 2a
go to statement or identify leaf
Statement 2b
go to statement or identify leaf
Statement
Types/Dichotomous key for leaves
Identification
Name/Number of Leaves
Statement 3a
go to statement or identify leaf
Statement 3b
go to statement or identify leaf
Statement
Types/Dichotomous key for leaves
Identification
Name/Number of Leaves
Statement 4a
go to statement or identify leaf
Statement 4b
go to statement or identify leaf
Statement
Types/Dichotomous key for leaves
Identification
Name/Number of Leaves
Statement 5a
go to statement or identify leaf
Statement 5b
go to statement or identify leaf
Statement
Types/Dichotomous key for leaves
Identification
Name/Number of Leaves
Statement 6a
go to statement or identify leaf
Statement 6b
go to statement or identify leaf
Statement
Types/Dichotomous key for leaves
Identification
Name/Number of Leaves
Statement 7a
go to statement or identify leaf
Statement 7b
go to statement or identify leaf
Statement 8a
go to statement or identify leaf
Statement 8b
go to statement or identify leaf
Statement
Types/Dichotomous key for leaves
Identification
Name/Number of Leaves
Statement 9a
go to statement or identify
Statement 9b
go to statement or identify leaf
Statement
Types/Dichotomous key for leaves
Identification
Name/Number of Leaves
Statement 10a
go to statement or identify leaf
Statement 10b
go to statement or identify leaf
Statement
Types/Dichotomous key for leaves
Identification
Name/Number of Leaves
Statement 11a
go to statement or identify leaf
Statement 11b
go to statement or identify leaf
(Score for Question 2: Click or tap here to enter text. of 3 points)
2. Can more than one dichotomous key be developed to identify the same group of organisms? Explain. To answer this question, refer to this lesson’s dichotomous key for birds.
Answer:
Type your answer here. Click or tap here to enter text.
(Score for Question 3: Click or tap here to enter text. of 3 points)
3. If two different people use the same dichotomous key to identify the same organism, should they have different results? Explain.
