10.22376/ijpbs.2019.10.1.p1-12 Volume 3 Issue 4 2012(October - December) In the present study, by employing highly sensitive and simple plant bioassay, lessThan i greaterThan Allium cepa lessThan /i greaterThan micronucleus test (MN test), genotoxicity of soil samples collected from the agricultural field near thermal power plant was evaluated. Roots of lessThan i greaterThan Allium cepa lessThan /i greaterThan were treated with 10, 20. 30, 40 and lessThan i greaterThan 5 lessThan /i greaterThan 0% solution of extract of soil samples at room temperature in dark. Genotoxicity was expressed in terms of frequency of micronuclei in root tip cells. Treatment of roots caused concomitant increase in the frequency of micronuclei in root tip cells. The result shows that extract of soil induced genotoxic effect in the root tip cells which may be due to presence of heavy metals. LALIT KUMAR GHOSH, ABHA AND ANAND M. JHA Genotoxicity; agricultural soil, Allium cepa; micronucleus. 25-31