A species is a group of organisms with similar characteristics which can potentiall interbreed and produce fertile offspring. A population is a group of organisms of the same species who live in the same area at the same time.
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2 main modes of nutrition
Autotrophs -make their own food. Heterotrops -obtain food from other organisms.
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How do autotrophs make their own food?
They absorb carbon dioxide, water and inorganic nutrients from the abiotic (non-living) environment and use them to synthesise all the carbon compounds they need.
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Modes of heterotrophic nutrition
Saprotrophs, consumers and detritivores
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Saprotrophs and obtaining food
Obtain nutrients from dead organisms by external digestion (decomposers), they secrete digestive enzymes into materials.
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Which carbon compounds are digested externally?
Cellulose, protein and saprotrophs then absord the substances they need.
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Consumers and obtaining food
Feed on living organisms by ingestion, either alive or recently killed.
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Detritivores and obtaining food
Obtain nutrients from detritus by internal digestion (detritus: dead material from living organisms, including dead leaves/roots, parts of decomposng animals and feces)
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Heterotrophic plants and algae
Can no longer make food by photosynthesis and instead obtain carbon compounds directly from plants or from fungi living on roots of trees.
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Other cards in this set
Card 2
Front
2 main modes of nutrition
Back
Autotrophs -make their own food. Heterotrops -obtain food from other organisms.
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