obtain simplest inorganic substances from their environment
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Chemoautotrophs
obtain energy from chemical reactions involving inorganic substances
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Heterotrophs
cannot synthesise molecules from inorganic substances - they need an external source of organic carbon
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Ingestion
the process by which heterotrophs take up their food.
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Digestion
process by which heterotrophs break down the food they have ingested into particles small enough to be absorbed.
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Absorption
the uptake of vitamins, salts and the products of digestion. In mammals the substances are absorbed by certain villi of the small intestine. THe products of absorption are either respired or assimilated.
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Excretion
the waste products of metabolism are expelled from an organism
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Holozoic Nutrition
feed on relatively large pieces of dead organic material.
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Parasitic Nutrition
feed off matter that is usually still alive
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Saprotrophic Nutrition
Feed on dead matter which is absored in solution or ingested as very small pieces. Enzymes are secreted onto the food and the soluble products are then absorbed (extracellular digestion)
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Assimilation Efficiency
refers to the % of the energy that an organism ingests that is assimilated rather than egested.
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Other cards in this set
Card 2
Front
obtain energy from chemical reactions involving inorganic substances
Back
Chemoautotrophs
Card 3
Front
cannot synthesise molecules from inorganic substances - they need an external source of organic carbon
Back
Card 4
Front
the process by which heterotrophs take up their food.
Back
Card 5
Front
process by which heterotrophs break down the food they have ingested into particles small enough to be absorbed.
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