The significance of primary producers lies in their ability to convert solar energy into chemical energy through photosynthesis. These organisms, including plants, algae, and some bacteria, form the base of the food web, providing energy and nutrients for higher trophic levels. By producing organic matter, primary producers sustain herbivores and, subsequently, carnivores, ensuring ecosystem functionality and stability. Additionally, they play a crucial role in maintaining atmospheric conditions and contributing to the overall health of ecosystems.