Cell organelle which exhibit cartwheel structure in transverse section:
(a) is helpful in cell division in almost all plant cells
(b) is not covered by any membrane
(c) is a self duplicating unit
(d) contain microtubules composed of Dynien protein
A and C are incorrect
B and C are correct
Only A is incorrect
Only B is correct
Cartwheel structure is found in centrioles of microtubules in animal cell but centrioles are absent in plant cell therefore statement A is wrong.
A pair of centrioles are present in centrosome within a pericentriolar area without any membrane and they can duplicate themselves therefore both statements B and C are correct.
The microtubule contain tubulin protein instead of dynein and therefore statement D is also wrong.
Hence the correct option is 2.