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Abstract-Dyes are chemical compounds which are used to convey colour to various materials, but during the processing and operation it produces toxics and hazardous side product which is very harmful to ecosystem and biodiversity. Researchers are developing various methods to degrade such toxic dyes and use of noble metal nano particle as a catalyst is emerging field of interest among scientific community. In this research article we had scanned our previously synthesized silver nanoparticle from Citrus medicapeels extracts; Synthesis and characterization were previously reported by authors.SynthesizedAgNPs has excellent photo-catalytic potential against various toxic dyes like Methylene blue, Rose bengal, Acridine Orange, Methyl Orange. Our nano-catalyst methylene blue nearly 52.15% in 5 hours while in absence of nano-catalyst dye degrades nearly32.85%. It is also capable of degrading acridine orange study shows it degrade Acridine orange dye 58.74% in just 4 hours and rose bengal dye 59.57 % followed by 4 hours of Continuous UV absorption. It also degrades methyl orange dye nearly 52% in 10 hours of solar irradiation. Synthesized AgNPs can be used as photo-catalyst for degrading toxic dyes.

The paper provides a floristic account of the S. R. T. Campus (HNB Garhwal University, Tehri Garhwal, Uttarakhand) which enumerates 193 taxa, distributed under 158 genera and 70 families of Angiosperms, Gymnosperms and Pteridophytes. Life form analysis revealed the presence of 65.28% herbs, 17.62 % shrubs 12.44 % trees, and. climber 4.66%. Asteraceae, Poaceae, Fabaceae, Lamiaceae, and Rosaceae revealed as the dominant families (in term of number of species) which together contributed 36.46% in the total species count. Desmodium with 4 species revealed as the dominant genus followed by Carex, Solanum, and Indigofera (3 species each). Of these, 17.13% species bears white flower, 15.47% yellow, 11.61% Pink, 9.94% green, blue 7.185.52 purple, 4.42% red while rest of the species (28.74%) bears flowers of other than colour class.