Multiple Choice
Which statement best describes the relationship between a carpel and a pistil?
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1. Introduction to Biology
Introduction to Taxonomy
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What is the hallmark of dichotomous keys in biological taxonomy?
A
They classify organisms based on genetic sequencing alone.
B
They group organisms by their ecological roles.
C
They use a series of paired, mutually exclusive statements to identify organisms.
D
They rely solely on physical appearance without any structured approach.
Verified step by step guidance1
Understand the concept of a dichotomous key: A dichotomous key is a tool used in biological taxonomy to identify organisms based on a series of paired, mutually exclusive statements or questions.
Recognize the hallmark feature: The key characteristic of a dichotomous key is its structured approach, where each step presents two contrasting options, leading the user to the next step or the identification of the organism.
Clarify the incorrect options: Genetic sequencing alone is not the basis of dichotomous keys; they often rely on observable traits. Grouping organisms by ecological roles is not the purpose of dichotomous keys, and relying solely on physical appearance without structure does not align with the systematic nature of dichotomous keys.
Highlight the correct answer: Dichotomous keys use paired, mutually exclusive statements to systematically narrow down the identification of an organism.
Conclude with an example: For instance, a dichotomous key might ask, 'Does the organism have feathers? (Yes/No)' followed by further paired questions based on the answer, ultimately leading to the organism's identification.
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