Any change in the environment of an organism is called___________?
Correct answer: A. Stimulus
- A. Stimulus
- B. Variation
- C. Response
- D. Reaction
Explanation
A stimulus is any detectable change in the internal or external environment, such as light, temperature, pressure, or a chemical change. Variation means a difference in characteristics, while response is the organism's reaction to the stimulus, so choosing either confuses the cause with the result.
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About Receptors
Receptors are specialized cells or proteins that detect stimuli such as light, sound, pressure, temperature and chemicals, then initiate responses through sensory or hormonal pathways. Questions distinguish sensory receptors from effectors, compare receptor types, and examine stimulus conversion into nerve impulses, including the roles of rods, cones, chemoreceptors and mechanoreceptors.
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