And who told you that ??
Did father of Indian nuclear program sit for Gate type exam of applied for junior positions in DRDO ?
en.m.wikipedia.org
You are misinformed , The main Indian institutions for research are IISC Banglore and various IITs .
If you have qualifications ( like PHD from renowned Universities and relevant work experience ) .
You can get job of professor in IISC or IITs and then can do research with the help of government facilities .
Infact IISC and IITs prefer candidates who have obtained PHDs from top Universities of the world.