Given below are a few common reflexes in humans. Classify them as a simple or condition reflex.

(i) Knee-jerk

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Solution

Answer: Simple reflex

Knee jerks occur when the knee is tapped below the knee cap. The leg is involuntarily extends as a result of a sharp touch below the kneecap. Hence, it is a simple reflex.

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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 - ______________

Which of the following is not involved in knee-jerk reflex?

(a) Muscle spindle (b) Motor neuron (c) Brain (d) inter neurons

Given below are a few common reflexes in humans. Classify them as a simple or condition reflex.

(iii) Tying of shoelaces while talking

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