Hello Hasitha,

I will be attesting links for each of your requirement and you have to carry out out thorough reading of each link.

Scope of biochemical engineering can be referred from https://www.quora.com/What-is-the-scope-for-biochemical-engineering-in-India-1

scope of food technology can be referred from https://www.quora.com/What-is-the-scope-of-B-Tech-food-technology-in-India-and-abroad

furthermore, Detailed informtion about the prospects of food engineering in India can be referred from two links https://www.getmyuni.com/food-technology-engineering-colleges and https://collegedunia.com/courses/bachelor-of-technology-btech-food-engineering

Go through this link and decide which course would be  best for you.

Hope your query is resolved. I wish you best of luck in your future endeavor.