Final answer:
Isopods, including pillbugs, exhibit both kinesis and taxis in response to environmental stimuli. Kinesis involves random movement to find favorable conditions, while taxis is a directed movement towards or away from stimuli.
Step-by-step explanation:
Isopods, such as pillbugs, demonstrate both types of movements: kinesis and taxis. When responding to a stimulus in an undirected manner, they exhibit kinesis, which can be further broken down into orthokinesis and klinokinesis. Through this type of movement, isopods will change their speed (orthokinesis) or increase their turning behavior (klinokinesis) to randomly locate an environment that is more favorable for their survival, especially when exposed to extreme temperatures.
In contrast, taxis is a more directed form of movement toward or away from a stimulus. Although the provided information does not give a specific example of isopods showing taxis, this behavior is common among many organisms in response to various stimuli such as light, chemicals, or gravity, indicating that isopods may exhibit this behavior under appropriate conditions too.
Therefore, the correct answer to the query, 'Do isopods show kinesis or taxis?' is 'c. Both', because they have the innate ability to display both random and directed movements in response to environmental stimuli.