"VC has resigned," DU's media coordinator Malay Neerav said without giving details.
The resignation of Singh, who was instrumental in introducing the FYUP, has come two days after the varsity was asked by the UGC to roll back the controversial four year course.
Singh has been under attack over the FYUP which was introduced last year but came under renewed criticism ahead of start of this year's academic session.
Matters came to a head when the UGC gave an ultimatum to the DU and its affiliated colleges to give up the four-year course and revert to its old three-year structure. They were asked to comply with the order by forenoon yesterday.
However, the principals of the colleges affliated to DU met yesterday and decided to defer this year's admissions which were to start today.