Graded Assignment Name: SCI203B: Biology | Unit 3

| September 12, 2019

Graded Assignment Name: SCI203B: Biology | Unit 3 | Lesson 3: Laboratory: Dichotomous Key Date: 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 2a The bird has a crest of feathers on the top of its head. Statement 2b The bird has a smooth head. go to statement or identify bird go to statement or identify bird blue jay 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. (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 1a Statement 1b Statement 2a Statement 2b Statement 3a Statement 3b Statement 4a Statement 4b © 2007 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Score go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf Page 1 of 3 Graded Assignment Statement 5a Statement 5b Statement 6a Statement 6b Statement 7a Statement 7b Statement 8a Statement 8b Statement 9a Statement 9b Statement 10a Statement 10b Statement 11a Statement 11b SCI203B: Biology | Unit 3 | Lesson 3: Laboratory: Dichotomous Key go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf go to statement or identify leaf (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. Score Answer: (3 points) Score © 2007 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 2 of 3 Graded Assignment SCI203B: Biology | Unit 3 | Lesson 3: Laboratory: Dichotomous Key 3. If two different people use the same dichotomous key to identify the same organism, should they have different results? Explain. Answer: Your Score © 2007 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. ___ of 26 Page 3 of 3 A dichotomous key is a guide that helps you navigate through a classification system. How might you identify an insect you found in your backyard, if it looked like nothing you had ever seen before? You could use a tool called a dichotomous key, which would help you identify the group of insects it belongs to. A dichotomous key is a type of identification guide that presents pairs of statements about a specific characteristic. By selecting the proper statement in a pair, you move through a process of elimination that eventually helps you identify one species from several in a group. For example, a dichotomous key of insects might begin with the following pair of statements: 1a. The antennae are smooth. Go to 2. 1b. The antennae are feathery. Go to 3. Notice that both statements focus on contrasting aspects of one characteristic: the appearance of the antennae. If the pair of statements had been “The antennae are smooth.” and “The wings form a crisscross pattern on the back.” you wouldn’t get very far. What if the insect had neither of those characteristics? Examples that will be to refer to answer number 2 …
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