Articles > Quizzes & Surveys > Stimulus definition – quiz Stimulus definition – quiz Quiz Choose the best answer. 1. Detects stimuli and relays signals to the CNS Receptor Brain Effector 2. The site of the decision-making process Receptor Brain Effector 3. Stimulus coming from within the body of the organism External stimulus Internal stimulus Sensory stimulus 4. Plant growing towards the light source Phototropism Gravitropism Homeostasis 5. Signals from the cochlea convey to the brain the information about orientation Vision Taste Balance Send Your Results (Optional) Your Name To Email Time is Up!