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Instinct, Tagging, Conditioning and Imitating

Which of the ...

Question

Which of the following is not an example of reflex action?

A

Dilating of pupil when light falls on it

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B

Coughing when some irritant enters the nasal cavity

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C

Blinking of eyes

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D

Sudden jerky withdrawal of hand or leg when pricked by a pin.

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Solution

The correct option is C Blinking of eyes
Blinking of eyes is not a reflex action, but it is involuntary action. A reflex action is one which occurs spontaneously whereas involuntary action happens without the conscious choice of an organism. The way the iris in our eye adjusts the size of the pupil in response to sudden bright or dim light is a reflex action. But blinking of eyes is an involuntary action.

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Q. Blinking when a beam of light is suddenly focussed on the eyes and sudden withdrawal of hand upon touching a hot body are some of the examples of reflex actions. Which part of the central nervous system acts as the centre these actions?

Q. Which of the following is/are incorrect?
I) Reflex arc is the pathway that involves the transmission of impulse from CNS to effector organ only
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III) The nerve that carries the impulse towards the CNS is an afferent nerve.
IV) Part of the central nervous system involved in reflex action can be spinal cord, ganglion or brain.
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