What is $Q$ in the given structure of a cilium/flagellum?

The principal protein of cilia and flagella is

What is a centrosphere?

Which of the following is the odd one out?

Animal cells contain non-membrane-bound organelles called $..........$ which help in cell division.

Identify the incorrect statement regarding the centrosome and centriole.
$(a)$ The centrosome is surrounded by amorphous pericentriolar material.
$(b)$ In the centrosome,both centrioles lie parallel to each other,and both have a cartwheel-like structure.
$(c)$ The centriole is made up of peripheral tubulins from unspecified locations.
$(d)$ The central part of the centriole is a proteinaceous hub.