Read the given passage and answer the following questions :
Food chains and the energy flow within an ecosystem provide an important understanding of contingencies and mutual dependencies of organisms. The flow chart given below, depicts the energy flow within some members of a grassland ecosystem. The grass in the below ecosystem transduces 120,000 J of sunlight and fixes it into 12,000 J of energy. It is established that 90% of the energy of one trophic level is not passed to the next trophic level. Further assume that the energy transferred from one trophic level to the next is equally shared among the different organisms at that trophic level. Based on the information given and your knowledge, answer the following questions.

How many food chains are present in the food web depicted above?