I have done my B.Sc (zoology, botany, chemistry). Am I eligible for M.Sc in Food and Nutrition and what is the admission procedure?

Since you have completed a B.Sc. with a background in Zoology, Botany, and Chemistry, you might meet the eligibility criteria for an M.Sc. in Food and Nutrition at many universities. Some universities might require a B.Sc. in Home Science, Food Science, Nutrition, or a related field.