Question

156. Which of the following statements regarding
cilia is not correct ?
(a) The organized beating of cilia is controlled
by fluxes of Ca2+ across the membrane
(b) Cilia are hair-like cellular appendages
(c) Microtubules of cilia are composed of
tubulin
(d) Cilia contain an outer ring of nine doublet
microtubules surrounding two single
microtubules


plzz tell !! ​

Answer 1

cila hair like structure b

Answer 2

Answer:

(a) Cilia are 'minute, hairlike processes' on the 'surface of protozoans' or of 'metazoans cells' which by their 'motion accomplish' 'locomotion' or 'produce a current.'  

Explanation:

Each 'cilium' contains a 'peripheral circle' of 'nine doublet microtubules' arranged around 'two single microtubules'. Each microtubule is composed of tubulin proteins. Although the 'mechanism of ciliary movement' is not completely understandable.  

The 'microtubules' behave as a 'sliding filament' that moves like the 'sliding filaments' of 'vertebrate skeletal muscle'. The fluxes of 'Ca2+' across the membrane is not responsible for controlling the 'organized beating of cilia'.