Which of the following is NOT an example of reflex action by our nervous system?

Raju smells smoke in his house and runs out of home to save himself.

The correct answer is Option (4) → Raju smells smoke in his house and runs out of home to save himself.

A reflex action is an automatic, sudden, and involuntary response of the body to a stimulus. It happens without conscious thought and is usually handled by the spinal cord through a "reflex arc" to ensure a fast reaction for protection.

• The Smoke Scenario (Raju): While smelling smoke is a stimulus, "running out of the house" involves conscious decision-making. Raju has to perceive the smell, interpret it as a danger, and then choose a path to exit. This involves the cerebrum (the thinking part of the brain), making it a voluntary action rather than a reflex.

• The Sweet Dish (Puja): Salivation at the sight or smell of food is a conditioned reflex. It is an involuntary physiological response of the autonomic nervous system.

• Hot Plate/Icy Glass (Ravi and Rakesh): These are classic protective reflexes. When sensory neurons in the skin detect extreme temperatures, they send a signal to the spinal cord, which immediately triggers motor neurons to pull the hand away before the brain even processes the sensation of pain.