Isoproturon resistant biotypes of P. minor gained more plant height, leaf area and dry matter as compared to their susceptible counterpart from Kamal area. Susceptible biotypes from Bawal and Rohtak also gained more height as compared to that from Kamal but were slower to grow as compared to the resistant ones. All the resistant ones were dissimilar from their susceptible counterpart in the absence of three protein bands at molecular weights 15.8, 14.1 and 7.9 kdaltons.