Biotechnology

Not so sure about the rank. But the bio-medical is available till the end of the first phase counselling (1-20,000 Rank) because, in Biology stream, preference goes like:
Biotech
Bio-info (because there is a tag as CSE with specialisation in Bio-info)
Bio-med
My personal advice to you will be not to go for bio-medical. Although it's a great field to study, but there is isn't much you can do after B.Tech in bio-medical. So many of my friends despite having two digit rank in GATE are going for IT company jobs. Because they feel like there is no future in INDIA for a student graduating from Biomed or biotech.
Hope it helped.

Hi, Nand
For the lateral Admission in B.Tech Biotechnology, you should have 55% marks. You will have to attend JEE/ AIPMT/ HPCET or any equivalent entrance test recognised by Government. For this course you can join Shoolini University, for more information: http://shooliniuniversity.com/programme/biotechnology/btech.

Bachelor's degree in plant biology offer candidates to work in the laboratories, farming industry, classrooms as well as medical facilities.Candidates seeking to work in plant biology can browse professions like a plant biochemist, food science technician or agricultural manager. Candidates can work in various fields including farming sector, or teaching positions.
Top job positions: plant taxonomist, plant ecologist, plant morphologist, plant cytologist, plant physiologist, plant geneticist, palynologist, plant pathologist, teacher and lecturer, etc.

If done from the right college and in the right way, then every sector is fairly appreciable. It is you who has to decide your sector of interest based on your profile and personal interest.

Yes, you can as it depends upon the marks obtained by the candidate in the NET examination.

All these subjects are equally imported. It depends upon the persons interest and its ambition in life. The subject selection completely depends on person's interest, intelligence and inspirations.

Better Field depends on your area of interest in the particular subject. If you are inclined towards science then science is a better field for you.

Yes, you are eligible for M.Sc in food, and dietetics.