Hey ,

For B.Sc in computer science ,Aspiring students should have completed 10+2 or its equivalent examination with Physics, Chemistry, Physics, and English. Those who have 3 years Diploma Course after S.S.C. or Intermediate Commerce or Arts Examination are also eligible.

So , if you have heard that biology is required for B.Sc in computer science  , then it is completely wrong.  Also you even think that biology and computer science are such two different topics , so how can biology be a prerequisite for computer science.

For more details about computer science , do follow the given link :

https://www.careers360.com/computer-science-course

Hope it helps!