INTRODUCTION 1.1 Basic Idea Reasoning and Observation are the core principles of Science. As a Science, Psychology investigates Behaviors. Psychology allows understanding the mental and physiological processes associated with a particular behavior (Desiderato et al., 1976, Babu, 2014 ). Psychology studies activities of people. It has been assumed that irrespective of contexts, a behavior is a response to stimuli. It occurs for the interaction between Person and Environment. In Psychology, human behavior can be classified in several ways. Depending on spontaneity, it is either Molecular or Moler Behavior. Again depending on visibility, it can be Overt and Covert. Moreover, depending on needs, it can be either Voluntary or Involuntary. Human behavior has a lot to do with survival on earth. As per the biological principles the more an animal adapted to its environment the more it lives on earth. Here, two basic processes, Adaptation and Natural Selection help. Genetic heritage and environmental conditions often mold human behavior. Changes in human behavior are linked with changes occurring at chromosomes. Human behavior is controlled by biological elements namely hormones and neurotransmitters. Along different bodily organs have significant roles in formation of certain behavior. Modern Psychology is more concerned with behavior than concepts namely mind. An age old concept on Mind Body relationship finds its presence while discussing human behavior. Body is related with Brain while Mind is related to consciousness. Mind is non-physical while,