Am I eligible to take admission in an MSc in Biotechnology after completing my Bachelors in Botany?

Yes, you are eligible. But entering into Biotechnology after a graduation degree in Botany you need to go through a rigorous course comprising different subjects like Immunology, Microbiology, Biochemistry, etc. along with new lab techniques. You can try for exams like GAT-B/IIT JAM if eligible for