Nerve impulse, reflex action and photoreceptors

2019 Odisha 1 question

1. 1 Neural Control and Coordination Medium
   Which of the following statements is not correct?
   A An action potential in an axon does not move backward because the segment behind is in a refractory phase B Depolarisation of hair cells of cochlea results in the opening of the mechanically gated potassium-ion channels. C Rods are very sensitive and contribute to daylight vision. D In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction.
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