Abstract: One of the open questions of Cosmology is the physics of the Early Universe. In the past decade the Cosmic Microwave Background Radiation is the dominant observation to test the early Universe models (Inflationary models). However, recently Large Scale structure surveys introduce new opportunity to test these models. In this talk I will show, how the statistical properties of galaxies and cluster of galaxies as the tracer of dark matter can be used to address the physics of Early Universe. Then I will show how the scale and direction dependence of bias parameter (between dark matter halo and dark matter perturbations) can be used as a probe to test Non-Gaussian and Anisotropic inflationary models.