Hello Atharv,
Firstly B.Sc Agriculture and B.Tech Biotechnology both are totally different fields. I explain you about both courses partially but I recommend you to choose the field in which you are interested.

• B.Sc Agriculture:

B.Sc Ag is a 4 year(8 semester) degree program in which you learn about agriculture and it's applications. This course consists of agriculture science and modern agricultural techniques.
Best colleges:
1. Tamil Nadu Agricultural University
2. Acharya NG Ranga Agricultural University
3. Punjab Agricultural University
4. Banaras Hindu University
5. Indira Gandhi Krishi Vishwavidyalaya
And many more.
Jobs after B.Sc Ag:
1. Agriculture Officer
2. Agriculture Technician
3. Agriculture Reasearch Scientist
And many more.
The average entry level salary for B.Sc graduate is about 5-6 LPA.

• B.Tech Biotechnology:

Bachelors of Technology in Biotechnology which is commonly known as B.tech in Biotechnology is one of the best specializations in engineering courses. It is a four year degree program. Biotechnology means any technological application that uses biological systems or living organisms to create or modify products or processes for a specific use.
Best Colleges:
1. IIT Delhi
2. IIT Kharagpur
3. MAHE Manipal
4. IIT Roorkee
5. IIT Guwahati
And many more.
Jobs after B.Tech Biotechnology:
1. Clinical Researcher
2. Pharmacist
3. Professional Lab Technician
And many more.
The average salary for B.Tech Biotechnology is around 6-7 LPA. If you are completing degree from IITs or NITs, you may get higher packages also around 8-9 lakhs average per annum.

Hope this will help you.

Thank you!