WH and KFL-mediated AgNPs shows a broad band at 420–460 nm for the solution containing 5 ml of plant extracts and varied concentrations of AgNO3. A sharp band at 430 nm was observed for the PG-AgNPs and TH-AgNPs synthesized using the aforesaid concentration of these extracts. The SPR bands vary with different plant-mediating AgNPs although the colour obtained was reddish-brown. This implies the role and nature of reducing and capping agents present in the plant extracts