3.1 Autotrophs and heterotrophs

Autotrophs (self-feeders)
Organisms that make their own organic compounds.

Use energy and inorganic molecules to synthesise organic molecules

Examples: plants, algae and many bacteria

Autotrophs (self-feeders)
Energy for carbon fixation from inorganic chemical reactions.
Chemosythetic autotrophs
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Chemoautotrophs, they live in environments where hydrogen is available. Energy is obtained from a carbon-fixing in which carbon dioxide and hydrogen react to form a simple organic molecule: methane.
Photosynthesis autotrophs
– Organisms that obtain the energy required for carbon fixation from light or sunlight.

Combines carbon dioxide and water using solar energy to produce organic compounds

Examples: Algae, Euglena and cyanobacteria

Photosynthesis autotrophs
Turns inorganic carbon into organic compounds
Carbon fixation
Organisms that are unable to make their own food

Cannot use simple inorganic substances to make organic compounds. They obtain from other organisms.

Examples: bacteria, animals and fungi

Organisms with a broad diet that are ale to eat a mixture of both plants and animals.

Examples: Humans, bears and lizards

Omnivorous heterotroph
Obtain their energy and nutrients directly from other living organisms.

Tapeworm (endoparasites)
Ticks (ectoparasites)

Parasitic hetertrophs
Feed on dead and decaying organic material

Examples: strawbeery and fruits

Saprotrophic heterotroph

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