Explanation:

These committees are extra-constitutional in nature and are nowhere mentioned in the Constitution. Under the Government of India Transaction of Business Rules (TBR), 1961 executive arm of government is assigned task of conducting the business of it in an effective and convenient manner. This is why cabinet committees are constituted. All Committees of Cabinet except Cabinet Committee on Parliamentary Affairs (CCPA) is chaired/headed by Prime Minister. CCPA is headed by Union Home Minister.