AnswersEF Environmental Science 1st Nine WeeksLab: Using a Dichotomous KeyQuestion 2
2
QuizMultiple Choice

Lab: Using a Dichotomous Key

Question 2 • EF Environmental Science 1st Nine Weeks

Refer to this portion of a dichotomous key for fish identification to answer the question.1. (a) Has a single dorsal fin ® 5 (b) Has a double dorsal fin ® 25. (a) Has small fin on back near tail ® 6 (b) Has no fin on back near tail ® 76. (a) Has barbs near the mouth ® Catfish (b) Does not have barbs near the mouth ® 10What do the numbers after the arrows represent?

Answer
A
the number of the question that should be considered next
B
the number of steps remaining before the organism is identified
C
the number of questions that need to be answered
D
the number of species that have the described characteristic

Explanation

In a dichotomous key, each choice tells you which numbered step to follow next. For example, choosing “has a single dorsal fin” directs you to step 5, while choosing “has barbs near the mouth” identifies the fish as a catfish. Thus, the numbers after the arrows are the numbers of the next questions to consider.

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