Hii!
There are a number of good Colleges and Universities in Bihar providing MSc course in Zoology or botany. Some of them are-
* Magadh University, Gaya
* Patna University, Patna
* B R Ambedkar Bihar University, Muzaffarpur
* Lalit Narayan Mithila University, Darbhanga
* Jai Prakash University, Chhapra
* Bhupendra Narayan Mandal University, Madhepura
Etc.,
Mostly the admissions are going on. You can visit the respective College's or University's official website to check for the dates of admissions.
Hope this helps.
Good luck!