B.Sc

Yes, with 78% in CBSE Board, you can definitely get admission for B.Sc (Hons) Food and Nutrition.

No, you have to clear all the subjects in B.Sc.

For B.Ed, there are total 64 semesters. In 1st semester, it is a common syllabus for all. In second semester, you have to select 2 methods. It maybe physical Science and mathematics. And other 2 subjects will be common as other students.

Hi Ditipriya,
Yes, you can get in Delhi with these marks.

If you can visit college, I suggest you to go there you will get better information there.
Or, you can contact to them on their website.

Both are best colleges of Delhi University.
According your travel expenses and accommodation choose the college.

Hi, no you can't appear in entrance exam because according to UGC regulations you should possess a passing certificate and have passed in all class 12th subjects.

Hi,
You will can't get admission with this score in Delhi University College. You have to give entrance exam for M.Sc.
For more information regarding M.Sc Admission process visit Delhi university website.