Topic Content:
- Definition of Irritability
What is Irritability?
Irritability is the ability of an organism to respond to stimuli such as temperature, light, pH, gravity, and chemicals.
A change in the environment is the stimulus, and the reaction of the organism to it is the response. In single-celled organisms, the response is the result of a property of the cell fluid called irritability.
Organisms respond to stimulus in three ways namely tactic (or taxis), nastic (or nastism) and trophic (ortropism) response.
Taxis:
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Responses