dear aspirant,

You can apply for the Bachelor's Degree Programme (BDP) at IGNOU which includes BSc programme. One of them is Life Science.So, you need to select elective courses of life science or LSE in order to get a degree in that.Now, since you are planning to do BSc in biology you will also need to take lab courses( those courses which have a (L) marking are lab courses) that forms 25% of your credits. Attendance is compulsory for lab.You need to take a second elective from the rest 3 i.e, (maths, physics and chemistry) such that it carries a min of 8 credits. You may do it in 1st year or second year.

best of luck.