* Photosynthesis: Grass, like all plants, contains chlorophyll. Chlorophyll allows them to absorb sunlight and use its energy to convert carbon dioxide from the air and water from the soil into glucose (sugar). Glucose is the plant's food source.
* Autotroph: Because they produce their own food, plants are called autotrophs. This means they are self-feeding and don't need to consume other organisms for energy.
* Base of the food chain: Producers like grass form the foundation of the food chain. Herbivores eat grass, and then carnivores eat the herbivores. Without producers, there would be no food for the rest of the ecosystem.
In short, grass is a producer because it can create its own food through the process of photosynthesis, making it a vital component of the food chain.