Dear aspirant

Yes, biology students can also become IAS just you should have a graduate degree in any courses of biology. You must complete your graduation in field of biology. If you are mbbs student and you have completed your final year and didn't completed internship then also you can apply you will have to show the result of final year university exam. If you doing other bsc courses and you have given your final year exam and waiting for result then also you can apply for that. Minimum age requirement is 21yrs and upper age limit is 32yrs for general candidate.

You can check various eligibility criteria for IAS exam from link below

https://www.google.com/amp/s/competition.careers360.com/articles/upsc-ias-eligibility-criteria/amp

Hope it was helpful

Thank you