What is stimulus ?

Give the technical terms used for the following: When a stimulus is strong enough to evoke response.

Do plants also respond to stimulus ?

Fill in the blancks miniumum strength of stimulus required to initiate mucle contraction is........ .

Give the technical terms used for the following: When a muscle is stimulated by an inadequate stimulus, no contraction occurs. If two or more inadequate stimule are given in rapid succession, the muscle contraction is evoked.