If you wish to pursue biotechnology throught engineering you will need to give the entrances like IIT-JEE,State entrance exams,AIEEE etc
On the other hand if you wish to take up B.sc biotechnology you will get an admission on the basis of 12th merit.
Hope this helps.
For information on the colleges offering these course log on to http://www.youngbuzz.com/colleges-guide
Kindly revert for further queries.