[1] He made significant contributions to the fields of genomics analysis, cytogenetics, plant breeding, tissue culture and cytotaxonomy.
[1] Roy became a Professor and Head of Botany at Patna University[3]: 210 at a young age of 37.
Later he held the positions of Dean of Science and Coordinator, UGC Centre of Special Assistance in Cytogenetics at Patna.
[2]: 185 He established an active school on Cytogenetics of plants in the fifties at Patna University.
[2]: 187 Roy won Birbal Sahni Gold Medal in 1973[4] and Jawaharlal Nehru Fellowship in 1975.