Which of the following is an unconditioned reflex action?

Knee jerk

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Playing musical instrument

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Knitting without looking

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Reading as well as writing

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Solution

The correct option is A
Knee jerk

Knee-jerk is an unconditioned reflex action. All others are conditioned reflex actions.

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Similar questions

(a) What is meant by reflex action?

(b) State whether the following are simple reflexes, conditioned reflexes or neither of the two.

(i) Sneezing - __________________

(ii) Blushing - ___________________

(iii) Contraction of eye pupil - _________________

(iv) Lifting up a book - _________________

(v) Knitting without looking - ____________________

(vi) Sudden application of brakes of the cycles on sighting an obstacle in front - ______________

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