**2. Bioindicator**

Bioindicators are described as living entities such as planktons, microbes, animals and plants that are operated for screening the environmental health of ecosystem. They have immense potential of qualitative analysis of health of environment and biogeographical variation in their surrounding [19]. The balance of intracellular and extracellular caused the membrane permeability to alter as ions transverse the cell membrane [20]. Thus, insects are considered as potent heavy metal bioindicator of environmental pollution.
