Hey Sumit, there are more than 10 different subjects available in which you can pursue admission in biology stream.

For instance, some of the available courses are:

1. M.Sc biotechnology

2. M.Sc Genetics

3. M.Sc Botany

4. M.Sc Bioinformatics

5. M.Sc Micro-biology

The subjects you will choose must be the one you are most interested in as you will have to study it for 2 years and without interest, this task will become extremely difficult for you.

You can research one by one about the different subjects. 
For the university, I would like to know more about the place you are doing your B.Sc from and where you are willing to study(state).

Please tell me in comments so that I can help you.