Final answer:
It is true that in the mayor-council system, the executive leader is chosen from among members of the Legislative Assembly and not appointed by the governor.
Step-by-step explanation:
It is true that under the mayor-council system, the leader of the majority in the Legislative Assembly is chosen from among its members. This system was different from earlier arrangements where the governor had the power to select members of the executive council. In this more democratic arrangement, the executive council was responsible to the elected members of the Legislative Assembly, creating a system of accountability to the electorate. This shift reflects the broader historical trend of moving towards a more representative and responsible government structure.