(a) A plan of merger or consolidation shall be adopted in the following manner:
(1) If the members of any merging or consolidating nonprofit corporation are entitled to vote thereon, the board of directors of the nonprofit corporation shall adopt a resolution approving the proposed plan and directing that it be submitted to a vote at a meeting of members entitled to vote thereon, which may be either an annual or a special meeting. Written notice setting forth the proposed plan or a summary thereof shall be given to each member entitled to vote at the meeting within the time and in the manner provided in this chapter for the giving of notice of meeting of members. The proposed plan shall be adopted upon receiving at least two-thirds of the votes entitled to be cast by members present or represented by proxy at the meeting.
(2) If any merging or consolidating nonprofit corporation has no members, or no members entitled to vote thereon, a plan of merger or consolidation shall be adopted at a meeting of the board of directors of the corporation upon receiving the vote of a majority of the directors in office.
(b) After the approval, and at any time prior to the filing of the articles of merger or consolidation, the merger or consolidation may be abandoned pursuant to provisions therefor, if any, set forth in the plan of merger or consolidation.