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Hope you are doing great, so Yes!!! you can do. IISc offers integrated PhD programme for students who have obtained a bachelor's degree in basic sciences/pharmacy/agricultural/veterinary sciences from a recognized University.
You are also required to clear Joint Admissions Test (JAM) or Joint Entrance Screening Test (JEST) to qualify for the integrated PhD programme.

Integrated PhD is actually divided into 4 basic disciplines:

1. Biological Science
2. Chemical sciences
3. Physical Sciences
4. Mathematical sciences