28. (1) The Academic Council shall consist of the following persons-Ex-officio members:(a) the Vice-Chancellor; ¹[(aa) the Pro-Vice-Chancellor or, if there is more than one, all the Pro-Vice-Chancellors;](b) the Deans of the Faculties;(c) the Professors and the Chairman of Departments other than Deans; ²[(cc) the Directors of the University Institutes;](d) the Librarian of the University;Nominated members:(e) ten Principals of affiliated colleges of whom at least three shall be from the Principals of Government colleges to be nominated by the Chancellor;(f) five persons from research bodies and centres of higher learning to be nominated by the Chancellor;Elected members:(g) two Associate Professors, two Assistant Professors and two Lecturers, other than Chairman of Departments ³[and the Directors of University Institutes], to be elected by the teachers themselves. (2) Members other than ex-officio members shall hold office for a period of two years and shall continue in office until their successors having been nominated or elected enter upon the office: Provided that the Associate Professors, Assistant Professors or Lecturers elected as such shall hold office so long as they continue to be such Associate Professors, Assistant Professors and Lecturers.