Question

what is meant by irritability

Answer 1

.. Irritability is the excitatory ability that living organisms have to respond to changes in their environment. The term is used for both the physiological reaction to stimuli and for the pathological, abnormal or excessive sensitivity to stimuli. It is usually used to refer to anger or frustration.
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Answer 2

The property of protoplasm and of living organisms that permits them to react to stimuli is IRRITABILITY