Science

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You can visit this URL
https://www.shiksha.com/college-predictor

Yes, you can do that, if you wish to take a deviation from your current field.

Yes, you can get, if the candidate is meeting the eligibility criteria as given below.
Age: No bar
1. Educational qualification for admission through entrance test B.Sc. (Hons. ). Physics (3 Year Course after 10+2) from
University of Delhi or any other University whose examination is recognized as equ

Yes, you can get admission for M.Sc Horticulture. The eligibility criteria is given below. Eligibility B.Sc Horticulture, B.Sc Agriculture, Agricultural Engineering, Agricultural Information Technology etc. With minimum aggregate score of 50% (45% for SC/ST/OBC candidates) at the level of graduation

You have not mentioned any specific programme. But, it's always best to take a PG programme that's relevant to your UG.

Yes, you can do that. But, you would have to start over fresh.

The eligibility criteria required for pursuing M.Sc Botany course is a pass degree in B.Sc Botany with a minimum of 40% marks from a recognized college or university. The minimum duration of M.Sc Botany course is 2 years, which is divided into four semesters.

Hi,
There are many subjects in B.Sc Agriculture. So, you can get many books according to your choice. Here is the complete list of reference books with subject for B.Sc Agri. https://www.sanfoundry.com/best-reference-books-bsc-agriculture/.