Zoology

There are over 140 M.Sc in Botany colleges in India. Please refer to the link provided below for a detailed list of these colleges. You should be able to navigate to a college of your choice using the filters on the web page. Download colleges brochure, read questions and student reviews. Compare colleges on fees, eligibility, placements and other details at this link.
Regards.
https://www.shiksha.com/science/colleges/m-sc-botany-colleges-india

Please refer to the link provided below for details regarding admission process followed to secure a seat in Maharshi Dayanand University from M.Sc in Zoology. You can download college brochure which contains specifics regarding admissions and if there is a sports quota offered by the institute for admissions. Alternatively, visit college web site for further details regarding this course.
(Website:- http://www.mdurohtak.ac.in)
https://www.shiksha.com/science/course/m-sc-in-zoology-maharshi-dayanand-university-rohtak-270858

I'm gonna answer the part about IISER. After completing your B.Sc, you could pursue an integrated M.Sc-PhD at any IISER (though the amount of people selected is pretty low compared to BS-MS dual degree). You could also try out Ph.D. after you get your Masters. Then you would have to sit through an exam and interview.

Hi,
As you are a PCB student and you have scored 70% which indeed is a good aggregate. Now, you just fill the form for further studies from any online kiosk and choose any five good colleges from lots of entries and then you go to the college for self-verification at the very centre allotted for the verification.
Following are the good colleges:
1) IEHE
2)Sarojini Nadu girls PG college
3) Maharani Laxmibai Girls PG College
These 3 are excellent government colleges.

There are a total of 92 seats for zoology in Delhi University out of which 46 are for general candidates.

Yes, you can apply. Forms are out at official site of PU today.

Please refer to the link provided below for eligibility criteria to pursue M.Sc in Petroleum Geology from The Maharaja Sayajirao University of Baroda.
https://www.shiksha.com/science/course/m-sc-in-petroleum-geology-the-maharaja-sayajirao-university-of-baroda-vadodara-179243