M.Sc

Sure you can. There is a criteria though for M.Sc which you will need to fulfill like your score in B.Sc and your score in the entrance exam, if any.

Yes, you can pursue M.Sc in phycology, but my suggestion is that you should opt for M.Sc in botany or zoology because you are from that back ground.

M.Sc in chemistry is a better option. M.Sc in zoology is difficult to pursue than M.Sc in chemistry.

Why do you want to do management when you are good in chemistry and you have done M.Sc. So, just prepare for CSIR NET, this will give you way to research field with respect and hand some money and if you are interested in teaching this will be a good scope for you and I think it is worth more than management.

These are some of the best universities for Biotechnology, please visit the websites if they offer Medicinal biotechnology. Very good academic standing during Bachelor's degree and a valid IELTS score will be required. Edinburgh Napier University, University of Warwick, Imperial College London, University of Wolverhampton, Universities of Oxford and Cambridge.

You should appear for NET-LS exam, and join a college as a lecturer, after that, opt for Ph.D.

Hello, Both are the best field.
Here I am providing you the experience of one person
https://www.quora.com/Is-it-a-good-decision-to-go-for-an-MTech-after-a-MSc-If-so-what-are-the-scopes-available-both-in-India-and-abroad

If you are interested in computers you may try and do a course pertaining to that field or go for Masters in zoology.

If you have opted for maths, you must be a brilliant student. You should opt for the course in which you have a keen interest.