Detailed Explanation:

Parliamentary System is characterized by the fusion of executive and legislature, where the executive (Council of Ministers) is drawn from and remains collectively responsible to the legislature.

Article 75(3) mandates that the Council of Ministers is collectively responsible to the Lok Sabha — meaning the government must maintain the confidence of the lower house to remain in power. This accountability to the legislature is the defining feature that distinguishes a Parliamentary system from a Presidential system (where the executive is independent of legislative confidence).

Direct election of Lok Sabha, power to amend Constitution, and permanent nature of Rajya Sabha are features found in various democratic systems and do not define the Parliamentary character of government.