B.Sc

Yes, it does offer. You can visit its website for information or read about them in Shiksha articles as well. mmumullana.org is the website.
https://www.mmumullana.org/custom/graduate-courses-bsc-medical-non-medical

I am suggesting you to wait for the cut-off list, 2019, and then you'll get to know the exact chances of your admission. Though you have a good percentage in OBC category, may be you'll get a good college (but not the North Campus).

Yes, Dyal Singh College has B.Sc. Hons in Botany course. As Dyal Singh college comes under University of Delhi, so take admission in this college. You have to first fill the registration form for Delhi university (DU) and then wait for the release of cut offs and then you can apply for the admission in Dyal Singh college on basis of your 12th score only if you met their cut-off requirement. For more details about Dyal Singh College, refer to the following link:
https://www.shiksha.com/college/dsc-dyal-singh-college-lodi-colony-Delhi-2319.