Q:

What is a stimulus in biology?

A:

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.

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.

Sources:

  1. globalgiving.org

Is this answer helpful?

Similar Questions

  • Q:

    What is a "niche" in biology?

    A:

    The niche that an organism occupies is the opening in the environment that the organism fills to make a living. A species' niche is its place in an ecosystem relative to the other organisms present.

    Full Answer >
    Filed Under:
  • Q:

    What is an example of a stimulus?

    A:

    In biology, a stimulus is a change in an organism's surroundings that causes the organism to change its behavior in order to make the environment more satisfactory. For instance, hunger motivates animals to seek food, predators stimulate prey to run away or hide, and falling temperatures encourage creatures to seek shelter or find warmth in other ways.

    Full Answer >
    Filed Under:
  • Q:

    What is structural adaptation?

    A:

    Structural adaptations are the physical features of an organism that help it to survive and succeed in its environment. Structural adaptations can affect the way the creature moves, eats, reproduces or protects itself.

    Full Answer >
    Filed Under:
  • Q:

    What are physical and behavioral adaptations?

    A:

    An adaptation is defined by National Geographic as a genetic change in the structure or habits of an organism to allow it to survive, protect itself and reproduce in its environment. Physical adaptations, such as plants that develop thick stems to store water in deserts, manifest in the structure of the organism, while behavioral adaptations, such as animals that migrate to raise offspring, appear as a social trait.

    Full Answer >
    Filed Under:

Explore