There are several options which you can do after b.sc botany and among them one of the most common option is to do M.sc in plat genetics, biotechnology, microbiology etc. After completing M.Sc you can apply for NET exam. Another option, you can go for MBA for that you have to appear for CAT/XAT/NMAT exam. You can also opt for government jobs like in Banks, civil services, UPSC etc.