must have the confidence of Lok Sabha, the lower house of the Parliament of India. The term of a prime minister can end before the end of a Lok Sabha's term, if a simple majority of its members no longer have confidence in him/her, this is called a vote-of-no-confidence. Three prime ministers, I. K. Gujral, H. D. Deve Gowda and Atal Bihari Vajpayee have been voted out from office this way. In addition, a prime minister can resign from office; Morarji Desai was the first prime minister to resign while in office. Upon ceasing to possess the requisite qualifications to be a member of Parliament subject to the Representation of the People Act, 1951. Role and power of the prime minister Executive powers The prime minister leads the functioning and exercise of authority of the government of India. The president of India—subject to eligibility—invites a person who is commanding support of majority members of Lok Sabha to form the government of India—also known as the central government or Union government—at the national level and exercise its powers. In practice the prime minister nominates the members of their council of ministers to the president. They also work upon to decide a core group of ministers (known as the cabinet), as in charge of the important functions and ministries of the government of India. The prime minister is responsible for aiding and advising the president in distribution of work of the government to various ministries and offices and in terms of the Government of India (Allocation of Business) Rules, 1961. The co-ordinating work is generally allocated to the Cabinet Secretariat. While the work of the government is generally divided into various ministries, the prime minister may retain certain portfolios if they are not allocated to any member of the cabinet. The prime minister—in consultation with the cabinet—schedules and attends the sessions of the houses of parliament and is required to answer the question from the Members of Parliament to them as the in-charge of the portfolios in the capacity as prime minister of India. Some specific ministries/department are not allocated to anyone in the cabinet but the prime minister themself. The prime minister is usually always in charge/head of: Ministry of Personnel, Public Grievances and Pensions (as Minister of Personnel, Public Grievances and Pensions) Cabinet Secretariat Appointments Committee of the Cabinet Cabinet Committee on Security Cabinet Committee on Economic Affairs NITI Aayog