How to fill Casual vacancies in the State Legislative Assemblies? Section 150 of Representation of the People Act, 1951
(1) When the seat of a member elected to the Legislative Assembly of a State becomes vacant or is declared vacant or his election to the Legislative Assembly is declared void, the Election Commission shall, subject to the provisions of sub-section (2), by a notification in the Official Gazette, call upon the Assembly constituency concerned to elect a person for the purpose of filling the vacancy so caused before such date as may be specified in the notification, and the provisions of this Act and of the rules and orders made thereunder shall apply, as far as may be, in relation to the election of a member to fill such vacancy.
(2) If the vacancy so caused be a vacancy in a seat reserved in any such constituency for the Scheduled Castes or for any Scheduled Tribes, the notification issued under sub-section (1) shall specify that the person to fill that seat shall belong to the Scheduled Castes or to such Scheduled Tribes, as the case may be.
The Representation of the People Act 1951
PART VIII
DISQUALIFICATIONS
Section 139 - 145 Chapters I to III. Rep. by the Representation of the People (Amendment) Act, 1966 (47 of 1966), s. 62
Section 146 Powers of Election Commission
Section 146A Statements made by persons to the Election Commission
Section 146B Procedure to be followed by the Election Commission
Section 146C Protection of action taken in good faith
Section 147 Casual vacancies in the Council of States
Section 148 Repealed
Section 149 Casual vacancies in the House of the People
Section 150 Casual vacancies in the State Legislative Assemblies