Abstract: In the biological world, many interactions exist between various species. These interactions generally, consist of predator-prey relationships, competition between species and beneficial relationships. One observed phenomenon, termed the fear effect, occurs when one species reacts to an increased risk of predation by another species. The fear response causes the affected species to reproduce and forage for food less. In some cases, the fear response can be beneficial, while in other times it can be harmful. In this thesis, we consider a four compartment food-chain model in which there exists a top-level predator, a mesopredator and two types of prey who directly compete with one another. The model accounts for each lesser species’ fear response to the next highest one. We aim to examine how competition and the fear effect can work together to adjust the structure of the food chain. We used some standard techniques of dynamical systems to glean some results about the long-term dynamics of the system. We found that the fear response and competition effects can play an important part in the long-term dynamics of the system and cause a restructuring in the food chain itself.