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The term 'dichotomous' in dichotomous keys refers to the process of dividing options into two distinct paths at each step for identification, which is true. Dichotomous keys are used to identify organisms by making successive binary choices until the correct identification is made. True.
Explanation:
The term dichotomous in dichotomous keys does indeed refer to the division of options into two distinct paths at each step of the identification process, making the correct answer to the student's question a. true. A dichotomous key is a tool commonly used in biology for classification and identification purposes. It operates on a series of binary decisions that guide the user through a pathway of choices, each with two mutually exclusive options, until the correct identification of an organism is achieved.
At each step, the key provides two contrasting statements or questions - for example, "leaves are blue" versus "leaves are some color other than blue". The observer chooses the option that best describes the specimen and follows the path determined by that choice, continuing through the key until they can make a definitive identification of the organism.
Dichotomous keys can range from simple versions used for identifying visible characteristics to complex ones that require thorough knowledge of organism traits and may need instruments like hand lenses or microscopes to discern specific features.
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