Hi Jeevalatha, You are eligible if you are a graduate. To do MBA, You must have 50% marks in graduation (any stream). Apart from this, you need to clear any national level entrance exam such as CAT/ MAT/ XAT/ LPUNEST/ NMAT/ CMAT/ GMAT. After qualifying written exam you have to go through GD or PI. Many colleges offer this course in India with different specializations. Give your best to Join top colleges as they increase the chances to get placed right after your Masters at a good package. There are a few good colleges which offer dual specialization. The best B-schools are:

Shailesh J. Mehta School
Xavier's Labour Relations Institute, Jamshedpur
Lovely Professional University, Punjab
Department of Management Studies, IIT Delhi
Indian Institute of Foreign Trade, Delhi (own test)
Management Development Institute (MDI), Gurgaon
Bharathidasan Institute of Management (BIM), Trichy
Narsee Monjee Institute of Management Studies, Mumbai
National Institute of Industrial Engineering (NITIE), Mumbai.

Hi Jeevalatha! Yes, you are definitely eligible for MBA. In fact, if you want to pursue Agri-Business Management, you stand a good chance. If you are applying for CAT, you must have 50% marks in aggregate in graduation if you are a General category candidate, and 45% if you are a reserved category candidate. For exams like XAT, MAT, CMAT etc. there is no graduation percentage cutoff.