Question

Which of the following is not a natural reflex action?

• A. Knee-jerk
• B. Blinking of eyes due to strong light
• C. Salivation at the sight of food
• D. Sneezing when any irritant enters the nose

Answer 1

The correct option is C Salivation at the sight of food

• A conditioned reflex is a learned response in which a stimulus becomes associated with a consequence.
• Salivation at the sight of food is a conditioned reflex while knee jerk, eye blinking, and sneezing are the natural reflex action.
• The natural reflex actions are the spontaneous responses to the stimulation of a receptor. E,g, Knee-jerk, Blinking of eyes due to strong light, sneezing when an irritant enters the nose, etc.
  So, the correct answer is C.