B.Tech Eligibility

Hi dear,
Marks of 10+2 does not affect your ranking as it not counted.
From 2017 onwards, jee has removed, however 75% or top 20 percentile is the eligibility criteria for IIT.
So concentrate over 10+2 studies, as it will ultimately help you in your jee mains.
BEST OF LUCK DEAR

For which university are you talking about?

Hello Himanshi, yes indeed. For admissions into bio related engineering courses taking biology in 12th is perfectly acceptable. However, there are some institutions that have mandated maths and physics as compulsory and choice between chemistry or biology. Hence, you need to check before applying.
Best wishes to you.

Yes, you can choose this depends on your NEET rank.

Yes, JNU offers B.Tech course.

Hello Rounak,
It is very nice to hear from you that you are interested in doing your engineering from Punjab University located in Chandigarh. It's quite well known in Punjab and whole of North India as an institute of repute. I am attaching a link that will give you all the required information about different aspects of the admission process for different courses in this university. https://www.shiksha.com/university/panjab-university-Chandigarh-4026/admission
Best wishes to you.

Go through the link below -
https://www.shiksha.com/b-tech/colleges/b-tech-in-biotechnology-engineering-colleges-Andhra-Pradesh.

Yes, you can do B.Tech after Diploma. You can get admission to 2nd year of B.Tech course directly as you have completed Diploma course. The general admission process in most of the institutes is on the basis of entrance tests. There are several state level and national level engineering entrance tests. Although some institutes provides direct admission on merit based on qualifying exam.