Abstract
Heavy metals are integral components of ecosystem. The distinctivenesscharacteristic of heavy metal is poisoning and resulting in the inactivation of enzyme systems. All heavy metals are potentially toxic at elevated concentrations. In the present investigation, effect of Lead nitrate[Pb (NO3)2], on the morphological parameters of black gram seedlings (Vigna mungo (L.)Hepper),the germination percentage and morphological parameters such as, root length, shoot length, number of leaf, total leaf area, root nodules,fresh and dry biomass were analyzed on the 15th days of seedlings. Among the all parameters were reduced in increasing the Pb(NO3)2 concentration when compared to control plants.

A14.TOXIC EFFECT OF LEAD NITRATE [Pb(NO3)2]ON THE BLACK GRAM SEEDLINGS