(a)  Many candidates gave an incomplete explanation.  Many stopped at “cations are positive ions” and not all positive ions are cations.
(b) Many candidates were unable to present a diagram that shows a cathode and an anode dipped in an electrolyte or they drew wrong diagrams connecting external components to an otherwise correct set-up.

Very poor performance was registered by candidates.

The expected answer is:

(a)   Cations – are positive ions that are attracted to the cathode (during electrolysis)
                                                                                                                       
(b)  Diagram

Correct diagram/sketch:  labeling cathode, anode and electrolyte.