1. The Council of States or Rajya Sabha is a permanent House and it is not subject to dissolution. After every two years, one-third of its members retire and its same numbers of seats are filled up by new members. The Lok Sabha is not a permanent House. It is dissolved after the expiry of its term of five years. But it can be dissolved before the period of five years by the President on the advice of the Council of Ministers. New Lok Sabha is elected and constituted within a period of 6 months from the date of its dissolution.