1, which can grow with simple inorganic substances as nutrients, is called autotroph.
2. Complex organic substances are needed as nutrients when growing, and this organic substance is called heterotrophs.
Green plants are autotrophic because their nutrition is water and carbon dioxide. Under the action of light, they convert water and carbon dioxide into starch and other organic substances. Animals belong to heterotrophs, because they have to live on the existing organic matter, and they can't make their own organic matter like plants. Among microorganisms, there are autotrophic and strange, but most of them are strange, such as parasitic microorganisms such as bacteria, viruses and fungi that make people sick, saprophytic microorganisms and microorganisms that spoil food.
Finally, autotrophs can be divided into two types: photoautotrophic and chemoautotrophic. Higher plants, cyanobacteria (a primitive unicellular algae with photosynthetic pigments in cells) can carry out photosynthesis and belong to photoautotrophy. Nitrifying bacteria belong to chemoautotrophic, and they can use the chemical energy released by inorganic oxidation.
Attached autotrophs other than green plants:
Autotrophic organisms include diatoms, scenedesmus, Volvariella volvacea and other green plants, such as cattail, lotus and duckweed.
Autotrophic microorganisms, such as azotobacter brownii, cyanobacteria and nitrifying bacteria.
Heterotrophic microorganisms such as rhizobia and denitrifying bacteria have been evaluated! Good: 0 You have already evaluated it! General: 0 You have already rated it! Bad: 0 You have already evaluated it! Original: 0 You have already evaluated it! Non-original: 0 Anonymous answer adoption rate: 21.1%2009-06-0612:13 Report satisfactory answer favorable rate: 0% (1) As an ecological word, it is also called independent trophic organism. Its original meaning refers to. There is no difference between these two metabolic systems, that is, substrate oxidation for obtaining energy and nutrient reduction for carbon assimilation. Today, this concept has been classified according to the oxidized nutrients as energy sources and their oxidation forms (chemosynthetic organisms, photosynthetic organisms, inorganic oxidizing organisms and organic oxidizing organisms), and according to the intake mode of nutrients from carbon sources and the synthesis mode of organic metabolites necessary for reduction and assimilation. Moreover, it is limited to the meaning of the latter and has a wide range of applications.
(2) Organisms that survive and reproduce by inorganic nutrition are the corresponding words of organic nutritious organisms. Organisms that assimilate carbon by using the energy obtained from chemical dark reactions such as respiration or photochemical reactions are called chemoautotrophs and photoautotrophs respectively. Typical examples of autotrophic microorganisms are red sulfur-free bacteria, red sulfur bacteria, green sulfur bacteria, nitrifying bacteria, sulfur bacteria, hydrogen bacteria, iron bacteria, carbon monoxide bacteria and so on. In autotrophic microorganisms, like hydrogen bacteria, organic nutrients (acetic acid, etc.) can sometimes be seen with the substitution of available electron donors (for example, acetic acid is generated from hydrogen). ) was replaced by carbonic acid assimilation. The mechanism of carbon fixed cycle and energy harvesting system, as well as the regulation mechanism of autotrophs on the adaptive function of organic matter, are being compared with photosynthetic organisms for biochemical clarification.