Producers, consumers and decomposers
Green plants, like grasses from a lawn or trees, use the light energy, water and carbon dioxide of the air to synthesize the substances they need by themselves, therefore they are called producers.
Animals, on the contrary, are not able to synthesize the foods they need by themselves and, in order to survive, they must eat plants or other animals, for this reason they are called consumers.
There are particular consumers who live by decomposing the organic substances of dead plants and animals, they are called decomposers. Bacteria and fungi are examples of decomposing organisms.
The kingdom of the Plantae (plants) includes autotrophic organisms capable of manufacturing the nutrients they need with photosynthesis starting from simple inorganic substances (water, carbon dioxide, mineral substances). Plants develop from an embryo devoid of the blastula stage. Their cells have a wall formed by cellulose and, in the cells of the green parts, cell organelles called chloroplasts are present.
Plants represent the main source of nourishment and oxygen for most living beings on our planet.
Main stages of the evolution of plants
Evolution of plants (source Iprase Trentino)