The definition of 'Appropriate Government' holds answer to your query. The Act defines
2 (b) "appropriate Government" means,--
(i) in relation to any scheduled employment carried on by or under the authority of the Central Government or a railway administration, or in relation to a mine, oilfield or major port, or any corporation established by a Central Act, the Central Government, and
(ii) in relation to any other scheduled employment, the State Government;
So as regards most industries except railways, mines, oilfields, major ports, corporations like LIC, it is the State Government.
If you have any specific unit in mind pl give more details to give advice.