Currently there are several methods for the production of Nanoparticles like Chemical and pysical methods. But there are evidences for the harmfulness of these nanoparticles to the environment. Now there is a need to grow more and more ecofriendly nanoparticles that are best suited to environment. Recently it has been shown that microbes and plants can synthesize nanoparticles in them. Moreover shape, size and nature can be controlled by these biological approaches through just modifying pH, temperature and nutrient media composition. Here we are utilizing general metabolic properties of cells and used to develop nanoparticles. This is an ecofriendly approach and with lots of benefits to human kind. So if we reinvestigate our manufacturing process and adopt more and more ecofriendly process then we can get more and more benefits of nanotechnology with miracles in daily life.