hi,

yes, you have to take biology as a mandatory subject in 10+2 course, if you want to do higher study in biology related stream like mbba, bds, bhms, bsc in anesthesia, b.sc nursing, b.sc in optometry or cardiovascular technology or dialysis technology , b.sc in physiotherapy etc. to become a medical physicist you have to study mbbs , you must have biology, english, physics, chemistry as mandatory subject in 10+2 course.