i completed 10+2 with pcm from telangana & took biology as an additional subject from maharashtra HSCboard. later done BSc in biology (chem bot zoo). will i be eligible for neet 2021 under code 06 as i completed BSc with such condition of taking additional subject from university other than 10+2?

Yes, you are very much eligible. There is no condition that you need to passed PCB from the same subject and same sitting

Maharashtra board doesn't have any provision to appear for single subject. Going by that, can you help us understanding if you completed your 12th again from Maharashtra Board after studying in M.P.C in Telangana? Do help us with this information. Because So to be eligible for NEET, you should have completed your 12th, passed in all subjects and secure a minimum aggregate of 50% in Physics, Chemistry and Biology. It is 50% for General Category, 45% for PWD and 40% for OBC,SC,ST. Now if you belong to OBC Category, the Category you belong to should be also listed in the Central OBC list. Or else you will be considered as General Category and so you have to secure a minimum aggregate of 50% in Physics, Chemistry and Biology. This 50% is inclusive of the Theory and Practical marks scored in Physics, Chemistry and Biology collectively. You needn't score 50% in Physics, 50% in Chemistry and 50% in Biology separately. You need an aggregate of 50% or 40% depending on your Category as an aggregate in Physics, Chemistry and Biology. And along with Physics, Chemistry and Biology, you should also have studied English as one of the core subjects in your 12th.