Structures Which Are Fully Developed in One Group of Organisms

question 12

Multiple Choice

Structures which are fully developed in one group of organisms but reduced or possibly nonfunctional in a similar group are referred to as

• A)vestigial structures.
• B)analogous structures.
• C)transitional structures.
• D)directional structures.
• E)homologous structures.

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Definitions:

Weber Fraction Values

Measures that quantify the smallest change in a stimulus that can be perceived, based on Weber's Law, which relates to the just noticeable difference in sensory perception.

Sensory Modalities

Various forms of senses through which living organisms perceive the world, such as sight, sound, smell, taste, and touch.

Detecting Pain

The physiological and psychological process by which organisms recognize and respond to stimuli that are noxious and potentially harmful.

Jnd

The minimum difference in stimulation that a person can detect 50% of the time, also known as the just noticeable difference.