Hello,
No there is no integrated course like Integrated M.Sc. for Zoology in IISER Thiruvananthapuram. If you are doing B.Sc. now, after completion of Bachelors you can do Integrated PhD (I.PhD) at IISERs. I.PhD involve MS and PhD. This is for 7 years divided into 14 semesters. MS will be in Biology only and not Zoology. But MS syllabus contains most area of biology. Also there is no option to exit after having MS.
Another option is to do PhD at IISERs after doing your Masters. The entry to IISER Thiruvananthapuram for I.PhD is through any of the three exams like JGEEBILS, JAM BL/BT papers, IISER Test. Then shortlisting occurs for interview which go through two rounds. According to me doing I.PhD is better because it give you experience to do PhD in an institute where you study for two years. It give you much help while you choose your guide rather than going for PhD to a new institute where you do not know about the faculties well.
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