SSC MTS EXAM

Detailed explanation-1: -There are both internal stimuli and external stimuli that an organism will use to detect changes and illicit a response if necessary.

Detailed explanation-2: -A stimulus can be external, meaning it occurs outside the organism, like the sound of thunder and the flash of lightning. A stimulus can also be internal, or from within the organism itself, like thirst or hunger. Both external and internal stimuli can cause a response, or reaction, from an organism.

Detailed explanation-3: -Internal stimuli are changes, experiences, or feelings that occur within someone. Examples include hunger, thirst, and emotional states. Internal stimuli are often contrasted with external stimuli, which are changes or experiences that occur outside.