Light has enough energy to influence the atoms and molecules of any organism.Also it has/produces heat which can be sensed by the sensory mechanisms of the organism.Some examples are photropism in plants, turning of sunflower towards sun,etc.
A stimulus is a DETECTECTABLE change in the environment. e.g. light is a stimulus to an animal or plant if it can detect the light with a sensing eye or chemical
Stimulus?
The difference between an external stimulus and an internal stimulus is that an external stimulus is a stimulus that comes from outside an organism. But an internal stumulus is a stimulus that comes from inside an organism. An example for an external stimulus can be that when you are cold, you put on a jacket. An example for an internal stimulus is that when you feel hungry, you eat food.
exagerrates the stimulus
The answer to this would mose probabaly be a stimulus. Because there are 2 types of stimuli Internal Stimulus and External Stimulus and so it has to be either one of these but the answer is stimulus.
Response. The stimulus is the light.
A stimulus is a DETECTECTABLE change in the environment. e.g. light is a stimulus to an animal or plant if it can detect the light with a sensing eye or chemical
The stimulus in the pupil reflex would be light
light
light waves
Light
light
An organism responds to a stimulus.
Complexity
)Movement or activity of an organism in response to a stimulus such as light.
Tropism is the movement of a plant away from or toward a stimulus. The most easily found example of tropism is a plant's response to light. Plants tend to grow toward the light. This tendency is called 'phototropism'.
The general term for this behavior is tropism. It can take a variety of forms, including phototropism (when the stimulus is light) and chemotropism (when the stimulus is a particular chemical).