Primary nutritional groups
group of organisms, divided in relation to the nutrition mode according to the sources of energy and carbon, needed for living, growth and reproduction
Primary nutritional groups are groups of organisms, divided according to the sources of energy, electrons, and carbon needed for living, growth, and reproduction. The sources of energy can be light or chemical compounds, the source of electrons can be organic or inorganic, and the sources of carbon can also be of organic or inorganic origin..
The terms aerobic respiration, anaerobic respiration, and fermentation (substrate-level phosphorylation) do not refer to primary nutritional groups, but simply reflect the different use of possible electron acceptors in particular organisms, such as O2 in aerobic respiration, nitrate (NO−3) or sulfate (SO2−4) in anaerobic respiration, or various metabolic intermediates in fermentation.
Primary sources of energy
Phototrophs absorb light in photoreceptors and transform it into chemical energy.
Chemotrophs directly absorb chemical energy from molecules.
The free energy is stored as potential energy in ATP, carbohydrates, or proteins. Eventually, the energy is used for life processes such as moving, growth, and reproduction.
Plants and some bacteria can alternate between phototrophy and chemotrophy, depending on the availability of light.
Primary sources of reducing equivalents
Organotrophs use organic compounds as electron/hydrogen donors.
Lithotrophs use inorganic compounds as electron/hydrogen donors.
This brief starts where responsible research should: with the source description of “Primary nutritional groups” as group of organisms, divided in relation to the nutrition mode according to the sources of energy and carbon, needed for living, growth and reproduction. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the general reference register because the source frames it as group of organisms, divided in relation to the nutrition mode according to the sources of energy and carbon, needed for living, growth and reproduction. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Jul 19, 2026. The linked authority identifier is Q902805. None of the 0 selected statements returned an explicit reference.
Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Primary nutritional groups”, its source revision and the description used here.
- Expand the search: follow Primary nutritional groups primary sources, Primary nutritional groups archive and Primary research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Primary nutritional groups”?
- Which institution is responsible for the underlying evidence?
- Which cited source is closest to the event, object or claim?
Search terms from this dossier
This entry incorporates text from “Primary nutritional groups” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.