Organisms that produce their own food are called producers. These producers are part of the biotic factors in an ecosystem. Green plants and bacteria can fall under this category. These organisms create their own food through photosynthesis. They are the basis for most ecological systems. Without producers, consumers like humans, would not have the food or energy they need to survive. These plants use the sunlight to make energy to fuel their functions. These plants also produce oxygen for other organisms to use.