Ecosystem Nutrition and Energy Flow

Ruminants like cows, sheep, and deer have a specialized four-chambered stomach that allows them to digest plant material in two steps: initial swallowing and fermentation, followed by regurgitation and re-chewing of cud. This breaks down cellulose more thoroughly.

Insectivorous plants grow in nitrogen-poor soils and trap insects primarily to obtain nitrogen, which is essential for protein synthesis and growth. They already produce their own glucose through photosynthesis and obtain oxygen from the air, so insects supplement mineral nutrients.

The true fungi or the eumycetes are special types of achlorophyllous thallophytic organisms living a parasitic or a saprophytic mode of existence; they are always heterophytes and never autophytes. They depend on others for food, but all other groups as algae, bryophytes and pteridophytes are chlorophyll containing green plants that are autotrophic.

Oceanithermus profundus follows chemolithoheterotrophic mode of nutrition. It is a moderately thermophilic, organotrophic, microaerophilic and facultatively chemolithotrophic bacterium isolated from a deep-sea hydrothermal vent site at 13-N in the East Pacific Rise.

Autotrophs are organisms that synthesize their own food, primarily through photosynthesis. Plants, algae, and some bacteria are autotrophs that form the base of food chains. Heterotrophs consume others, carnivores eat meat, and herbivores eat plants - but all are consumers, not producers.

Omnivores consume both plant and animal products, making them highly adaptable feeders. Humans, bears, and pigs are classic examples. Herbivores eat only plants, carnivores eat only meat, while 'consumers' is too broad a category (all non-producers are consumers).

 HUmans are omnivorous

Plants store carbohydrates in the form of starch, primarily in roots, stems, seeds, and tubers. Animals like bats, birds, and whales store carbohydrates as glycogen in their liver and muscles, not as starch. Starch is the plant-specific storage form of carbohydrates.

Autotrophs synthesise their own food by the process of photosynthesis.

Pesticides and harmful chemicals enters the food chain and gets concentrated at each trophic level on the food chain. This process is called biomagnification.

Amoeba exhibits holozoic nutrition, where it ingests solid food particles through phagocytosis, forming food vacuoles where intracellular digestion occurs. Saprotrophic nutrition involves feeding on dead organic matter externally, parasitic nutrition involves living on a host organism, and ingestion is merely the process of taking in food, not a mode of nutrition.

Partial stem parasites parasitise the host tissue to obtain only water and mineral salts from it.

Saprophytes feed on decaying organic matter.

The organisms that feed on the dead and decaying remains of plants and animals are called decomposers.

In parasitic mode of nutrition, the parasite lives in/on the body of the host and draws its nutrition from there.