Hi Anu,

JAM Biological Science would allow you to take M.Sc in biological sciences from an IIT/NIT/IISC. However, there is some news that Biological Science has been removed from JAM tests. In that case, your friend would have to prepare for JAM Biotechnology as the syllabus and scope is almost same. Infact the number of seats are also more for it, so there is greater chance to have admission. 

Otherwise your friend can go for M.Sc Botany in other universities or other courses like MBA if JAM is not cleared. 

All the best!