Heterotrophic nutrition is the nutrition of organisms which need ready made complex organic molecules, they obtain these wither directly from plants, or from organisms which have fed on plants. Thus heterotrophic organisms are the consumers in an ecosystem.
Organism that carry out heterotrophic nutrition are called heterotrophs
Involves feeding by ingesting complex organic matter which are then digested and absorbed
Example of organisms with holozoic nutrition are animals and insectivorous plants
Feed on the dead remains of other organisms(dead organic material).
Secrete enzymes onto the food, then soluble products are absorbed
Involves feeding by absorbing their required nutrients from dead organic matter.
Responsible for decay.
The decomposers in an ecosystem.
Fungi such as Rhizopus are saprobionts. Bacteria and fungi like musrooms, yeast and Mucor (bread mould)
Obtain food from another living organism, the host
There is a close association between the host and the parasite
The host suffers some degree of harm.
Taenia, the pork tapeworm, is a parasite, the adult is an endoparasite of human beings, thus we are the primary host, it is found attached to the wall of the small intestine of an infected individual, where it absorbs the soluble products of digestion.
Large surface area for absorption
No alimentary canal
Thick outer covering (tergument)
Suckers and hooks for attachment to gut wall, to resist peristalsis
Large numbers of offspring produced
Reduced nervous system