B.Sc

Yes, anytime you can pursue B.Sc. through distance after the completion of BE if core science urges this from your inner you.

Hi Harmanpreet Singh,
University of Toronto and University of British Columbia are the best ones. Other good universities for biotechnology are:
University of Saskatchewan,
Wilfrid Laurier University
Queen's University
University of Windsor
Check the university websites for admission requirements and apply.

Hi,
Apart from doing B.Tech or B.Sc, you can pursue BCA followed by MCA. As you have done 12th in science with computer application, you will get an added advantage over here.

Yes, you can do the same.But, it has an entrance test.

Hi,
You can go with M.Sc in any one of your combination. Then appear NET for lectureship. You can do B.Ed. for teaching profession. You may think for studying genetics / biotechnology / biochemistry like specialized field. Yes, you may pursue for MBA also.

Yes, ofcourse, you can pursue this course.

Hi,
You first need to complete the degree so it might take a year or two and then Masters is for 2 years more. While most of the courses abroad are credit based and duration can be shorter, it depends on you to study and work hard.