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NEET2019ZoologyNeural Control and CoordinationActual

Which of the following statements is not correct?

Options

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

Correct answer

C. Rods are very sensitive and contribute to daylight vision

Step-by-step solution

Option (c) is not correct because rods and cones are photoreceptor cells in our eyes. The rod cells contain a purple pigment rhodopsin that is useful in night vision or scotopic vision. Daylight (photopic) vision and colour vision are the functions of cones.

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