CBSE 12th

Yes, this college accepts JEE score. Your score is enough for admissions into this campus.

It's mandatory to get 70% and above in 12th and more than 150 marks in JEE Mains to get admission in agricultural engineering.

Yes, for the first two years, you have to take courses in Physics, Chemistry, Biology, Mathematics, and Earth Science. I don't think that it's a problem even if you don't have biology in class 12th, the faculty at IISER-Pune is aware of this and are more than capable of accounting for it. Don't be surprised if, at the end of two years, you end up loving biology.

Hello Durga,
This is a deemed to be University and admits students based on online entrance exam conducted by it. If you score well then you will get admission. I am attaching a link that will give you all the required information.
https://hindustanuniv.ac.in/admission_eligible.php

Yes, you can get admission in BBS with this score.

Yes, you are eligible to take UPTU exam.

Yes, the syllabus is same but the pattern of annual examination is somehow different in both of them.
Hope I have solved your query. Do upvote if you are satisfied with the answer.

You can take PCB i.e Physics, Chemistry and Biology. These subjects will be best suited for your 12th class to pursue your B.Sc in Biotechnology.
Hope I have solved your query.

No, it's not necessary but you have to complete your 3 years Diploma with 60%. You can apply for lateral entry after completing B.Sc.

Click on the link and watch the video till the end.
After watching this you will be able to find a probable list of colleges in which you have a chance to get with your rank.
https://youtu.be/hOlit6Un7l0