Hi Priya 

You can pursue MSc. in zoology or you need to decide whether you are interested in pursuing MSc and then applying for Doctorate or you want to go for a integrated Post graduation-Doctorate course(a total of 5 years).Then you can appear in the exams like  CSIR NET (life science) or UGC NET (environment science) or GATE (Evolution or ecology), which will give you fellowship  or will help in funding for Junior Research Fellow.

While your Doctorate(P.hd) you will be completely inclined towards research.After that you can works aas

1..work as a scientist for any organisation.

2.Professor or lecturer in any reputed institute(Be a part of research and development team)

3.Work for Pharmaceutical and related sectors(at Big companies in R&D team )

Good luck