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Interaction of Autotrophs and Heterotrophs in Ecosystems
While speaking in terms of the food chain, organisms are classified by trophic or their feeding level in the ecosystem. Autotrophs such as plants that produce their own food, form the producer level. All food chains begin at the producer level. Primary consumers eat producers to obtain energy. Primary consumers are eaten by secondary consumers; secondary consumers are eaten by tertiary consumers, and so on.

A common example to explain the food chain of ecosystems where grass is a producer, and rats that eat grass become the main consumers. The mouse becomes the prey for snakes, who become secondary consumers. The light eats snakes, and becomes a tertiary consumer. Dead animals are consumed by decomposers, and thus nutrients are mixed back into the soil. The cycle of nutrient flow from one level to the next continues to repeat between the biotic and abiotic components in the ecosystem.

Plant Organisms
Plants refer to organisms that are included in Regnum Plantae. In it enter all the organisms that are very commonly known to people such as trees, shrubs, terna, grasses, ferns, mosses, and a number of green algae. About 350, 000 species of organisms are included, not counting green algae. Of that number, 258, 650 species are flowering plants and 18, 000 species of mosses. Almost all plant members are autotrophic, and get energy directly from sunlight through the process of photosynthesis.

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Categoria: Ciências e Investigação