Section 140(5)(c) in The West Bengal Panchayat Act, 1973
(c)The members of the newly constituted Zilla Parishad, other than the ex officio members, shall, subject to the provisions of section 145, hold office with effect from the date of its first meeting at which a quorum is present for the unexpired portion of the term of office of the members of the Zilla Parishad of the former district.