Hello! Talimao, 

Your biology marks in class 12 would affect if it doesn't fulfill the following criteria :

Candidates belonging to unreserved category should have a minimum of  required percentage of 50% in chemistry, physics and biology /biotechnology  in their class 12 exam or HSC examination. 

Candidates belonging to sc, st, obc  category should have a minimum score of required percentage of 40% marks in Physics, Chemistry and biology /biotechnology  in class 12 or HSC examination. 

Good luck....