Hello Dear Student,
Please Mention the Name of University in which you are interested for PhD Admission.
Please elaborate your Question for a Good Answer.
If I talk about PhD in Science Stream then first you must have Masters degree in a relevant field like Physics, Chemistry, Zoology, Botany, Mathematics and etc.
If you are a CSIR NET or UGC NET Qualified Candidate then you can take admission in a PhD programme of any University by just appearing in Interview process.
If you are not a NET Qualified Candidate then you have to appear in Entrance Examination Conducted by University (In which you are Interested) after clearing the exam you will be called for Interview and After the Interview you can join PhD programme in a relevant field.
All the Best
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