7. (1) The Chairman may resign his office by giving notice in writing to the Board; and on such resignation being accepted, shall be deemed to have vacated his office. (2) The Vice-Chairman and any other appointed or elected member may resign his office by giving notice in writing to the Chairman; and, on such resignation being accepted by the chairman, shall be deemed to have vacated his office.(3) Subject to the provisions of this Act, the appointed or elected members shall hold office for a term of three years and may, on the expiration of such term be re-appointed or re-elected.(4) Notwithstanding the expiration of the term of three years mentioned in sub-section (3), an appointed or elected member shall continue to hold office until the vacancy caused by the expiration of the said term has been filled.