M.Sc

You need the following:
1. Acceptable score on a Graduate Management Admission Test GMAT or the Graduate Record Examinations GRE that has been written in the last five years.
2. IELTS/TOFEL
3. A Bachelors degree in Business Administration BBA or Commerce (BComm) or equivalent.A minimum of two (2) years documented professional or management experience.
GMAT and GRE scores must be no more than five (5) years old. The Admissions Committee looks for scores that indicate strength in the verbal, quantitative, and analytical writing assessment portions of the exams.

Yes, you can apply for admission in M.Sc Microbiology at Guwahati university. You should have a minimum pass percentage of 45% in your graduation to be eligible to apply. Preference will be given to candidates having Major/Honors Course in the concerned subject in order of merit or as specified by departments.
Admission Process
Register and Apply
Interested candidates can apply online or offline with required information.
Entrance Test
Eligible candidates need to appear for the entrance exam conducted by Gauhati University.
Merit Screening
Admission is based on the score obtained in University Entrance Test.
Regards.

Please refer to the link provided below for a detailed syllabus of the entrance exam conducted for a course in M.Sc in zoology from DU:
http://www.du.ac.in/du/uploads/pg-courses/msc_zool_Syllabus_4aug09.pdf.

ICAR AIEEA PG Exam Syllabus:
AIEEA PG consists of question from the Major subject chosen by the candidates. Please refer to the link provided below for a detailed syllabus for this exam.
https://www.shiksha.com/science/exams/icar-aieea/syllabus.

M.Sc. In Food Science & Technology (Under Special Courses of Study)
There shall be one paper of 120 minutes duration carrying 360 marks containing 120 multiple choice questions of undergraduate level from the disciplines of Agriculture, Dairy Technology, Food Technology, Agril. Engineering, Dairy Chemistry, Dairy Microbiology. Regards.