list of iit and nit offering Mtec ( pure ) biotechnology subjects not in its allied branches

Hello Manoj !

Some of the good IIT's and institutes offering M.Tech in Biotechnology are :

1. IIT Delhi
2. IIT Roorkee
3. IIT Mumbai,
4. IIT Kharagpur
5. IIT Kanpur
6. IIT Madras
7. There are many NIT's which offer specialization in this course you can visit this link for more information https://www.nitt.edu/
8. Anna University, Chennai, Tamil Nadu
9. Institute of Chemical Technology, Mumbai
10. Madurai Kamaraj University

You can visit following links for more information regarding this course offering in different IIT'S :

http://beb.iitd.ac.in/index.html

http://bioschool.iitd.ac.in/index.html

http://www.bio.iitb.ac.in/

https://biotech.iitm.ac.in/

http://www.iitk.ac.in/bsbe/

http://www.iitkgp.ac.in/department/BT

http://www.iitg.ac.in/biotech/

Hope it helps !