hello aspirant,

YES, You can do MSc Or MSc hons in zoology after BSc in biological sciences . You can also choose to do PhD after BSc by direct admission in renowned institutions like IISc. It is tough to get admission but for a merited student is a very good option.

the eligibility criteria for msc Zoology says that :

The candidate should have completed BSc(hons) zoology/ BSc(hons) biological science from Delhi University under CBCS or any other university whose examination is recognized as equivalent to University of Delhi and the candidate have to secure minimum 50% marks in aggregate in it.

Further, to know more about the Msc Zoology course in detail, you cna follow the below mentioned link to know more :

https://www.careers360.com/courses/zoology-course

I hope that this will help.