Which of the following describes an organism responding to stimuli.
A plant bending towards the light
A volcano erupting.
A dog drooling because she is about to be fed.
A mouse running to escape a bird.
The correct option that describes an organism responding to stimuli is: A mouse running to escape a bird.
To determine the correct answer, we need to understand the concept of stimulus and response in organisms. Stimulus refers to any detectable change in the internal or external environment that elicits a response from an organism. Organisms typically respond to stimuli in order to maintain their well-being and survive.
In the given options:
- A plant bending towards the light is an example of phototropism, which is a plant's response to light. However, plants don't possess locomotion, so they do not "run" to respond to stimuli.
- A volcano erupting is not an organism. It is a geological process where molten rock, volcanic ash, and gases are expelled from a volcanic vent.
- A dog drooling because she is about to be fed is an example of a physiological response to a stimulus (the anticipation of food). However, in this case, the response is involuntary and not a direct reaction to external stimuli.
- A mouse running to escape a bird is an example of an organism (the mouse) responding to the stimulus of an approaching predator (the bird). This response involves locomotion and is a direct reaction to an external threat.
Therefore, the correct option is: A mouse running to escape a bird.