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Which of the following statements is not correct?

1. In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction.
2. An action potential in an axon does not move backward because the segment behind is in a refractory phase.
3. Depolarisation of hair cells of cochlea results in the opening of the mechanically gated potassium-ion channels.
4. Rods are very sensitive and contribute to daylight vision.

Correct answer: Rods are very sensitive and contribute to daylight vision.

Solution

Rods are specialized for dim-light (night) vision and are highly sensitive, but they do not contribute to daylight vision. Daylight and color vision are mainly functions of cones, so that statement is the incorrect one.

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