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Modes of Nutrition
Biology AS

Hope Raybould

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Modes of Nutrition

Autotrophic Nutrition

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Use external sources of energy (energy from sun or chemical reactions) in the
synthesis of organic food materials. Autotrophs are the producers in the

Photosynthetic Autotrophs-
Obtain energy from suns radiation which is used to build essential organic
compounds from inorganic molecules by the process of photosynthesis.
Contain pigment,…

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Saprobiontic Nutrition-
Bacteria and fungi.
Organisms feed on dead/ decayed matter.
Do this by secreting enzymes to digest the material (lipase, protease, and
carbohydrase etc.) and then absorbs nutrients from the digested organic matter.
Digestion is classed as extracellular.
Saprobionts have no digestive system of their own.

Mutualistic Nutrition-


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Parasitic Nutrition-
A parasite is an organism which lives in close association with another living
organism, the host.
The parasite is dependent upon the host for food and can cause the host
Endoparasites live inside their host; Ectoparasites live on the outside of their

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Adaptations of Herbivores

Upper incisors replaced by horny pad
Sideways movement of jaw allows grass to be cut by lower incisors and
canines against horny pad.
Roots of teeth open so can grow continually
Diastema, toothless gap between incisors and premolars for forming bolus
Premolars and molars all same height…


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