Dear Friend

Dear Aspirant, you have asked a very practical question. A biologist is supposed to work in the field of science specailly as academecian or as a researcher or scientist. Critically speaking a biologist is supposed to do a job other than a management person. Means that a biologist is not supposed to take care of management or administration issues. This is a typicall case in private company or in industrial sector.
A biologist (Microbiologist, Biotechnology, Biochemistry, Botany, Zoology, Genetics) in university or research institute is also involved in administration besides teaching and research. Here if a person is withot an MBA degree, still involved in management of department (obviously at senior level).
As a biologist (after masters degree or doctoral degree) you are a technically qualified person. You know your subject very well and still you want to go in management aspects. Just think a technical person holding a MBA degree, it is really a very good combination.
A person holding a degree in Microbiology or Biotechnology working in an industry or private company. Here he or she will be involved in technical aspects or any work related to his or her expertise. If such a person pursue MBA (specially in Human development or mangement aspects), definitely the person will have have good chances of growth.
Being a microbiologist or biotechnologist, you are a technical person, now you have a MBA degree, therefore, you are also eligible to look after management or administration aspects. Now a person with MSc or PhD degree holder with a MBA degree will be definitely prefered over a person holding only technical or management degree.
Here you have to decide, whether you want to do MBA degree regularly or part time (correspondance), accelerated MBA, modular MBA. Ther are many institutes and universities in India which offer the MBA in different discipline.