Q23 / 200 · NEET 2006 · Botany

Which of the following statements regarding cilia is not correct?

  • A
    cilia contain an outer ring of nine doublet microtubules surrounding two single microtubules.
  • Correct answer
    B
    the organized beating of cilia is controlled by fluxes of $\mathrm{Ca}^{2+}$ across the membrane
  • C
    cilia arc hair-like cellular appendages
  • D
    microtubules of cilia are composed of tubulin

Solution

Cilia are minute, hair-like processes on the surface of protozoans or on metazoan cells. Each cilium contains a peripheral circle of nine doubled microtubules arranged around two single microtubules. Each microtubule is composed of tubulin proteins. The mechanism of ciliary movement is not completely understood. The fluxes of $\mathrm{Ca}^{2+}$ across the membrane are not responsible for controlling the organised beating of cilia.

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

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