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Response to external stimulus is called _______________

(a) reaction

(b) immunity

(c) response

(d) irritability

This question was addressed to me by my school principal while I was bunking the class.

My question is from Cellular Membranes in portion Cellular Membranes of Cell Biology

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Correct option is (d) irritability

The best I can explain: All organisms respond to external stimulus, a property known as irritability. Even the smallest amoeba and bacterial cell possess this feature. In response to external stimulus, a cell may activate from its whole range of metabolic pathways.

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