Zoology

To make a good career in banking and finance, ddopt comparatively tough path i.e. try to qualify different banking exams like PO. Government banks already offer graduate management programms to all aspirants. You will have a successful career thereafter. All the best.

B.Sc in zoology is not for below average students.

Yes, you can but the admission will depend on your score in B.Sc.

Dear,
If you don't want to enter into teaching job, you can enter into research field. And, for that, you need to invest approximately 7-8 years in studies.
If you don't want to invest much and not interested in research, you may consider Psychology as a option.
Do research on given topic and choose the way accordingly.
All the best.

All the courses you mentioned in your question has a good scope, just select any subject of your choice and field in which you want to make your career.

Chances are always subject to research qualifications and it doesn't matter which subject you choose. So, excel first in research.

The basic eligibility criterion for pursuing M.Sc (nutrition and dietetics) the degree is B.H.Sc/B.Sc home science with specialisation in the related field accredited by ICAR.
Some reputed colleges and institutes do conduct entrance examination to get admission in their M.Sc (Nutrition & Dietetics) degree course.