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 an irritant enters the nose

Answer 1

The correct option is C

Salivation at the sight of food

The correct option is C.

Explanation of correct option:

1. Reflex action is an immediate, fast, and involuntary bodily response to stimuli.
2. Natural reflexes are inborn reflexes that do not require instruction.
3. An acquired reflex is an acquired response in which a stimulus is linked to a specific outcome.
4. Human salivation in response to the sight, smell, or concept of delectable food is thus a conditioned reaction.
5. Even if the meal is not tasted, salivation happens (unconditioned stimulus).
6. Childhood conditioning contributes to our preference for pleasant foods.
7. For example, salivation at the sight of food.

Explanation of incorrect options:

Option A:

The spontaneous responses to the activation of a receptor are known as natural reflex activities. For example knee-jerk.

Option B:

Blinking of eyes due to strong light is also a natural reflex.

Option D:

Sneezing when an irritant enters the nose is the result of natural reflex activities.

Final answer: Salivation at the sight of food is not a natural reflex action.