Class 12 biology practical file 2024-25 July 8, 2019 16 32 64 128 Biology class 12 practical file pdf 2024 25 cbse Biology class 12 practical file pdf 2024 25 bihar board Biology class 12 practical file pdf 2024 25 up board Biology class 12 practical file pdf 2024 25 hindi medium Evaluation class 12 biology Biology 1010 lecture 5