Do integrated B.Sc. M.Sc. In life Science students have option for branch change after 1st year? Can we change branch to engineering?

It depends on which university you are studying if in your college there is any parallel course in which the subjects at first year is same, then they might let you change your course. But according to the best of my knowledge, you can't change branch after 1st year in B.Sc. And universities like DU