Do I have to give any entrance exam to study Microbiology at various colleges in Mumbai?

To study Microbiology in most Mumbai colleges, you usually do not need to give an entrance exam. Admission to B.Sc. in Microbiology is mostly merit-based, depending on your Class 12 marks in Science stream, especially Biology. However, some private or autonomous colleges may conduct internal assessm

No You don't need to give a special entrance exam like NEET or JEE to study B.Sc. Microbiology in Mumbai. Most colleges offer admission based on 12th standard marks.