11 Jun Biology 20: Module 3: Lesson 3 1 Assignment
Question
Module 3: Lesson 3 ASSIGNMENT
This Module 3: Lesson 3 Assignment is worth 12 marks. The value of each assignment and each question is stated in the left margin.
(12 marks)
Lesson 3 Assignment: Classifying and Naming Organisms: Dichotomous Keys
TR 2. Creating a Dichotomous Key
(12 marks)
Investigation 3.B: Creating a Dichotomous Key
Create a dichotomous key that can be used to identify the trees found on page 91 of your textbook or for the trees that can be found in your backyard or community park. Your dichotomous key may be in electronic format (e.g., made in PowerPoint) or in text format (made in a word-processing program or on paper).
The marking rubric for this assignment is provided. You can receive a total of eight marks for your dichotomous key.
4
3
2
1
Clarity
All steps are clear and easy to follow.
Most steps are clear and easy to follow.
Some steps are easy to follow.
Few or no steps are easy to follow.
Accuracy
The teacher and students can use the key to identify all the plant pictures correctly.
The teacher and students can use the key to identify most plants correctly.
The teacher and students can use the key to identify some plants correctly.
The teacher and students are not able to identify any plants using the key.
Procedure
Step 1: Study the 10 trees shown on page 91 of your textbook.
Step 2: If you think it will help you sort the trees into groups, make a copy of the page and cut out the pictures. If you chose not to do this, proceed directly to step 4.
Step 3: Use the blank dichotomous key shown below as a model for your dichotomous key.
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· Select one characteristic that will sort all the trees into two groups—B and C. (They either have the characteristic or they don’t.) Record this characteristic. Organize your cut-out pictures into the two groups.
· Looking at group B, select one characteristic that will sort the trees into two groups—D and E.
· Continue sorting all the trees into groups, and record the characteristics used. You are finished sorting when only one tree is left in each group.
· Each step of your key should offer two choices: has the characteristic, or doesn’t have the characteristic.
Once you have completed your key, see if it works!
(2 marks)
Analysis
Which characteristics of trees were not useful for creating your key? Explain why not.
Answer:
(2 marks)
Conclusion
Why does a key offer only two choices at each step?
Answer:
Once you have completed all of the questions, submit your work to your teacher.
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