Q140 / 180 · NEET 2019 (Odisha) · Zoology

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
  • Correct answer
    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

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.

Hence, the correct answer is option: 'C'.

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