Which of the following statements regarding cilia is not correct

Options

A. Microtubules of cilia are composed of tubulin
B. Cilia contain an outer ring of nine doublet microtubules surrounding two single microtubules
C. The organized beating of cilia is controlled by fluxes of `Ca^(2+)` across the membrane
D. Cilia are hair-like cellular appendages

Answer

C

Explanation

A ciliary beat comprises two phases: Power or effective stroke and recovery stroke. During an effective stroke, the cilia become stiff and move almost as straight, rigid rods with force against the surrounding medium. This pushes the water backward and the organism forward.