Microbiology

After BSc. one can go for MSc. MSc. too has good career prospects. Biotech is a booming sector and the growth oppurtunities are high. The Biotech sector includes - Biopharma, Biotech, Biotech services, Bioindustrial, Bioinformatics etc.
After doing MSc. Microbiology or Biotech, one can join R&D dept. of any good Biotech company. US is the best destination for Biotechnology. It stands out in the field of research as well as the biotech market is much developed in the US. Similar, is the case with UK, Canada and a few EU countries.

B.Sc in microbiology is a better option because of more scope as compared to marine biology.

Hi Rishab,
You must complete your Bachelor's degree first to be able to study a M.Sc. A four year Bachelor degree is required to study in Canada.

After B.Tech in biotech, your degree does not make you eligible for M.Sc in microbiology, it requires B.Sc. It would open more avenues for you to various places if you pursue M.Tech after B.Tech or M.Sc biotech further.

The M.Sc. Microbiology department at Abasaheb Garware College, Pune (Welcome to MES Abasaheb Garware College, Pune) has a very well-known and established Microbiology department. It is a granted course, and that's why the fees is less. The admissions are based on the aggregate of your B.Sc marks.
The microbiology departments at Fergusson college, Pune http://www.fergusson.edu/ (where I did my BSc from) and at Savitribai Phule Pune University are also very good.