what are the flags of this above mentioned realm?
Most feature a lion passant atop a St. Edward's royal crown with the name of the country across a scroll underneath, all on a blue background.
Commonwealth realm
Most feature a lion passant atop a St. Edward's royal crown with the name of the country across a scroll underneath, all on a blue background. 
when was o canada proclaimed the national anthem 1980 what was it got adopted from? "O Canada" should be designated as the national anthem and "God Save the Queen" as the royal anthem of Canada, one verse from each, in both official languages, to be adopted by parliament. what is the historical significance behind this royal anthem mentioned? It is the royal anthem in a number of Commonwealth realms, their territories and the British Crown dependencies.
wiki:19530609
Commonwealth realm [SEP] Flags
The governors-general throughout the Commonwealth realms also each use a personal flag, which, like that of the sovereign, passes to each successive occupant of the office. Most feature a lion passant atop a St. Edward's royal crown with the name of the country across a scroll underneath, all on a blue background. The two exceptions are those of, since 1981, Canada (bearing on a blue background the crest of the Royal Coat of Arms of Canada) and, since 2008, New Zealand (a St. Edward's Crown above the shield of the Coat of arms of New Zealand). The lieutenant governors of the Canadian provinces each have their own personal standards, as do the governors of the Australian states.