B.Ed

Hi,
Yes, you can do that because to pursue MBA, you need minimum 50% marks in graduation.
All the best.

Yes, you can apply for B.Ed. There are number of universities where you can apply for B.Ed. with 45%.

Hi,
Yes, you are eligible because most of the university do consider your Master's degree for the eligibility percentage in place of graduation. But, you need to check with the particular university for the admission process and eligibility.
All the best.

You can opt for the same from one of these colleges:
Jamia Millia Islamia (Centre for distance & open learning)
Indira Gandhi National Open University
Dr. Babasaheb Ambedkar Open University
M.D. University, Dept. of Distance Education
Himachal Pradesh University,
Karnataka State Open University
Madhya Pradesh Bhoj (Open) University
Yashwant Rao Chavan Maharashtra Open University

Yes, you are eligible to pursue B.Ed.

Dear,
Since 2015, the duration of B.Ed programme is 2-years and the universities or institutes that offer you 1-year B.Ed programme are not recognised.
You can go for a biology related subject in Bachelors degree like life Science, zoology or B.Sc programme and then go for B.Ed programme
You can check this link to find out some recognized institutes under NCTE.
http://ncte-india.org/ncte_new/?page_id=803
All the best.