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Hii Nidhi,
Here are some of the best colleges for B.Tech in food and science technology:-
1. Central Institute of Post-Harvest Engineering & Technology (CIPHET),
2. Central Marine Fisheries Research Institute (CMFRI),
3. Indian Veterinary Research Institute (IVRI),
4. Indian Institute of Vegetable Research (IIVR),
5. Central Institute of Fisheries Education (CIFE),
6. University of Delhi,
7. Faculty of Food Safety and Quality,
8. University of Mysore,
9. Jadavpur University,
10. Lovely professional University
There are many more colleges you can check here :- https://www.shiksha.com/science/colleges/colleges-india?rf=searchWidget&bc[]=146&bc[]=34&bc[]=86&bc[]=40&bc[]=41&bc[]=10&bc[]=42&bc[]=90&bc[]=26&bc[]=27&bc[]=28&bc[]=14&sp[]=17&sp[]=196&sp[]=197&sp[]=37&sp[]=198&sp[]=199&sp[]=200&sp[]=201&sp[]=202.

There is various opportunities after Masters in life science. You can choose to study further or work. You can do PhD in Life science. If you want to do job so you can try in both private and govt. sectors. In govt. sector, you can prepare for PSC, UPSC, SSC, etc. and in private sector, you can apply for different areas i.e. medical laboratory, biotechnology firms, nursery organization, government college, agriculture research organization, hospital, food institutes, wildlife and fisheries department and public schools.
There is a difference between biotechnology and life science. Life science is related to all fields of biology i.e. botany, zoology, animal physiology, and cells while biotechnology is related to technology in biology i.e. gene manipulation, gene splicing, etc. which are helpful in improving our lives and health.