Hello dear
According to the eligibility criteria of BHU PET for applied microbiology you must need any 2 of the subjects- botany , zoology ,biotechnology, microbiology, chemistry, industrial microbiology, life sciences, environmental sciences with minimum 50% Mark's in aggregate in your degree
So as such you had zoology for 3 years and if u have minimum 50% you can choose this and in botany also if u had secured 50% then you can choose this as 2nd subject and then apply for it .
Hope its helpful
Good luck
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