Photosynthesis is also the prime process that runs the entire food chain and thus forms the base of the food pyramid. Green plants, the producers of the food pyramid, depend on this process. Photosynthesis can be defined as, Synthesis of compounds with the aid of radiant energy. The process of Photosynthesis allows green plants to produce food and energy they require, all on their own. Hence making them an autotrophic breed i.e. they are self-dependent for food.
Other than these green plants, some protists (algae) and bacteria also use the photosynthesis process to feed, survive and grow. The ones who fail to produce their own food are called heterotrophs. All the other living beings, therefore, are in some way or the other eventually dependent on these autotrophs. The animals who feed on these trees and plants for their living, hence directly depending on them, are called the primary consumers of the food chain. These animals are the herbivores (plant-eaters), who form the source of food for the secondary consumers of food pyramid, the carnivores and the omnivores. The carnivores are the animals who eat only meat, while omnivores are the ones who eat both meat and plants for food. And similarly the food chain continues, making it clearly evident that the process of photosynthesis is the basic source of food and energy in our ecosystem.