A) radial spokes
B) central sheath
C) singlet microtubules
D) exonym
Correct Answer: C
Solution :
The movement of cilia and flagella is due to singlet microtubules. A cilium or flagellum possess three parts basal body, basal plate and shaft. The later is hair-like exposed part of flagellum or cilium and consist of sheath and axonemma for descriptive purpose. Axoneme again can be further distinguished into fibrils, matrix, central sheath, radial spokes and linkers. Axoneme contain 11 fibril 9 doublet on periphery and two singlet central (9+2). The two central singlet occur in central region and is covered by a sheath called central sheath.
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