Hello dear

so if you choose B.sc physiology , it only deals with zoology part which mainly focuses on human body parts

whereas B.sc botany will deal only with plants and its derivaties

so the 2 courses will only deal with one part which will not make  your preparation easy .

so you must  choose basic sciences in B.sc like chem,bot,zoo,phy either any of the 3 must  be available  in most of the colleges  and prepare one subject along with it.

hope its helpful

good luck

any queries drop down in the comment box