Plants are multicellular organisms in the kingdom Plantae that use photosynthesis to make their own food. There are over 300,000 species of plants; frequent examples of plants include grasses, bushes, and shrubs. Plants have an essential role within the worldâ€™s ecosystems. They produce most of the worldâ€™s oxygen, and are vital within the food chain, as many organisms eat plants or eat organisms which eat plants. The research of plants is known as botany. Plants are autotrophs; they produce their very own food. They do so by way of photosynthesis, which is the process of making nutrients resembling sugars from gentle vitality and carbon dioxide. Photosynthesis happens in cell organelles referred to as chloroplasts, which comprise chlorophyll and carotenoids, molecules that absorb light power and change it right into a usable type. Heterotrophs, however, are organisms that can not make their very own food and should eat different organisms to survive. Many heterotrophs eat plants.