The term Autonomous body denotes a self-governing body, independent, and subject to its own laws. If Autonomous Body or Institution is a company, it is regulated by the company law. If it is a society or a Trust, it is governed by the law on registration of societies or Indian government Act of Trust. But in all the cases, its own board of directors can specify the rules of business for the body / institution.
For simplicity sake, normally the boards of such bodies or institutions may adopt the rules of the concerned Government or department under which they work, but only by passing of a resolution to that effect, and that since it is an autonomous body, administration of which is not controlled by any other authority including any State Govt. / Union Govt. of India, (U.G.I.)