Question

Choose the correct answer from the options given below:

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

The correct option is C

Explanation for the correct option:

Salivation at the sight of food:

1. It is an acquired reflex action as the brain remembers the taste of the food due to prior experience when a person sees the food.
2. It is a conditioned reflex where the brain is conditioned to correlate between the sight and taste of the food.

Explanation for the incorrect options:

Option A:

1. Knee-jerk is the involuntary action which is an automatic and fast response to a stimuli.

Option B:

1. Blinking of eyes due to strong light is the involuntary action which cannot be controlled by the eyes.

Option D:

1. Sneezing when any irritant enters the nose is the involuntary action which can not be controlled so therefore it is natural reflex action.

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