Explanation:

Bokaro Steel Plant is the fourth steel plant in the public sector. It was started in 1965 in collaboration with the Soviet Union. It was initially incorporated as a limited company on 29 January 1964 and later merged with SAIL. It was first a subsidiary of SAIL and later a unit under the Public Sector Iron and Steel Companies (Reorganization and Miscellaneous Provisions) Act, 1978. The construction work of the factory started on 6th April, 1968.