Which of the following statements about the response of neurones to stimulus is correct?

The correct statement is: "Intensity of stimulus must reach a threshold value before the neurons can be excited." Neurons, which are the basic building blocks of the nervous system, respond to various stimuli by transmitting electrical signals. However, not all stimuli are strong enough to trigger this response. The stimulus must reach a certain level of intensity or strength, known as the threshold, before the neuron will be excited and transmit an electrical signal. If the stimulus is below the threshold, the neuron will not respond. This is why neurons must receive a stimulus of sufficient intensity before they can be excited.