Dear  Rajal,

As per your request here i am providing the top most 4 institute in india for b.sc food science with the way to take admission in them :

1. IIT Kharagpur ( B.Tech in Agricultural and Food Engineering)— through IIT-JEE exam
2. NIFTEM ( B.Tech.),Haryana— through IIT-JEE exam
3. Shaheed Rajguru College of Applied Sciences for Women, Delhi University ( BSc Food Technology)—Merit based admission ‘cutoff’
4. Bhaskaryacharya College of Applied Sciences, DU (BSc Food Technology)—Merit based admission ‘cutoff’ 
   
   hope you got your answer. 
   
   good luck :)