Notwithstanding section 120 of this charter, the Mayor shall have power and authority, when authorized by resolution of the City Council, to effect a merger of any one or more of the boards of commissioners enumerated in section 120, or of any other City board or department now existing or hereafter created, except the Board of School Commissioners, when, in the judgement of such Mayor and City Council more efficient and effective delivery of municipal services would result therefrom. The name of any department created by merger, the size of its board of commissioners, and then the scope of its jurisdiction shall be set forth in the resolution approving such merger.