Central Government Act
Section 21(1) in The Bihar Reorganisation Act, 2000
(1) For the purpose of giving effect to the provisions of section 12, the Election Commission shall determine in the manner hereinafter provided-
the number of seats to be reserved for the Scheduled Castes and the Scheduled Tribes in the Legislative Assemblies of the States of Bihar and Jharkhand respectively, having regard to the relevant provisions of the Constitution;
the assembly constituencies into which each State referred to in clause (a) shall be divided, the extent of each of such constituencies and in which of them seats shall be reserved for the Scheduled Castes or for the Scheduled Tribes; and
the adjustments in the boundaries and description of the extent of the parliamentary constituencies in each successor States that may be necessary or expedient.