Q:

What is a stimulus in biology?

A:

Quick Answer

A biologic stimulus is any external change in the environment that can be detected by an organism. The ability to respond to a stimulus is called irritability and is a necessary condition for life.

Know More

Full Answer

An example of a stimulus is an individual placing a hand on a hot surface. The temperature is the stimulus, and the individual then protects themselves by pulling their hand away. Other stimuli include the ability of an organism to detect the pH, salinity or light in their environment. All organisms must maintain homeostasis, a stable internal environment. Homeostasis can only be achieved through sensing and responding to the environment.

Learn more about Biology
Sources:

Related Questions

  • Q:

    What is meant by "form follows function" in biology?

    A:

    In biology, "form follows function" means that, within an organism, structures are formed in direct correlation to what they are meant to do. For example, a cat's paw and a human hand have similar bones, but each are designed to function much differently.

    Full Answer >
    Filed Under:
  • Q:

    How does a feedback loop help maintain homeostasis?

    A:

    Feedback loops help maintain homeostasis by allowing the organism to respond to changes in its environment. Feedback loops are important because organisms are always dealing with changes in environment or internal condition, so the feedback loop prevents those changes from going too far and becoming dangerous.

    Full Answer >
    Filed Under:
  • Q:

    What is an animal niche?

    A:

    A niche is the role an organism fills within its environment. What and where an animal eats are considered part of its niche. For instance, some birds, such as woodpeckers, eat insects in trees. This limits the bug population and keeps bugs from overtaking the environment.

    Full Answer >
    Filed Under:
  • Q:

    What is behavioral adaptation?

    A:

    Behavioral adaptation is the process by which an organism or a species changes its pattern of action to better suit its environment. It is contrasted with structural adaptation, which is the appearance of physical features that confer an advantage upon a species.

    Full Answer >
    Filed Under:

Explore