Where, by or under any Act, there is required to be, or there may be, established, constituted, or appointed any board, commission, committee, or other body of persons (whether incorporated or unincorporated) and the Governor is satisfied that it is necessary for that body to enter upon its functions forthwith but that it is not practicable for the full number of members of the Board to be elected or appointed within a reasonable time he may declare that Board to be duly established, constituted, or appointed if there are sufficient persons appointed or elected as members thereof to constitute a quorum at a meeting of that body; and on the making of that declaration that body shall, accordingly, be deemed to be duly constituted, established, or appointed.