Question 3.

1. Identify the action: Sunil touched a hot iron rod and withdrew his hand immediately. This indicates a quick response to a stimulus.
2. Classify the action: This is a reflex action, which is an involuntary and nearly instantaneous movement in response to a stimulus.
3. Define reflex action: A reflex action is a rapid, automatic response to a stimulus that does not involve conscious thought. It is controlled by the spinal cord and does not require brain involvement for the immediate response.
4. Draw a flow chart: The flow chart will include:
- Stimulus: Touching hot iron rod
- Sensory neuron: Sends signal to spinal cord
- Interneuron: Processes the signal
- Motor neuron: Sends signal to muscles
- Response: Hand withdraws from the hot rod.