Green plants → Insects Frog → Snakes → Peacock. From the above food chain it is clear that the peacock stands at the top. The green plants are primary producers ie, they synthesize the food (carbohydrate) by photosynthesis. The green plants occupy the first trophic level in any food chain. The micro consumers are popularly known as decomposers. They are saprotrophs and include chiefly bacteria, actinomycetes and fungi.