The correct statements regarding the Metropolitan Planning Committee (MPC) are 1 and 2 only because the MPC is indeed constituted under Article 243ZE of the Constitution of India, which mandates its formation in every metropolitan area to ensure proper planning. It is responsible for preparing draft development plans for the metropolitan area, thereby facilitating integrated and sustainable urban development. However, statement 3 is incorrect, as the MPC does not have the sole responsibility for implementing government-sponsored schemes; that role often involves various local authorities and government agencies. This differentiation is crucial for understanding the administrative structure and responsibilities within urban governance, a key topic in UPSC Prelims.