Science

Sorry, but you won't get admission with this percentage.

Yes, you can join navy by taking Combined Defence Service, this itself provides all the training of arms and ammunition to the cadets. Enroll yourself in CDS and work hard.

B.Sc B.Ed also known as B.Sc+B.Ed is an integrated course which includes subjects like:-
Chemistry
Botany
English
Mathematics
Physics
Zoology
And it is also have teaching and field work.

Yes, microbiology is a good career option only if you have interest and proper knowledge. In India, doing this course probably is not a great idea, because here Microbiology is still a developing subject. But in other countries like U. S it is a great option and also they have handsome package there. This is relevant in a variety of fields like, Hospitals, Agriculture, Pharmaceuticals, Biotechnology, Education, The environment.

The fees structure vary from college to college depending upon whether the college is government or private. Fees structure for government colleges is less than private colleges. Fees per semester for B.Sc. Biotechnology course is around 40000 or more in private colleges and around 20000 in government colleges. So do check the fees structure before taking admission in any college either by visiting college's website online or by visiting the college.

The admission is going on these days in the university.
Details about B.Sc are here:
https://www.mmumullana.org/custom/graduate-courses-bsc-medical-non-medical

Yes, it does offer. You can visit its website for information or read about them in Shiksha articles as well. mmumullana.org is the website.
https://www.mmumullana.org/custom/graduate-courses-bsc-medical-non-medical