Explanation:

Article 85(1) of the Constitution empowers the President to summon each House of Parliament to meet at such time and place as he thinks fit, but six months shall not intervene between its last sitting in one Session and the date appointed for its first sitting in the next Session. The power to summon and prorogue either House of Parliament or to dissolve the Lok Sabha vests with the President. The Rajya Sabha is a permanent House and is not subject to dissolution. However, nearly one-third of its members retire every second year.