We have already discussed the first type of heterotrophic nutrition, which is Holozoic feeding. Now we are heading to the second one.
2. Parasitic Feeding: A parasite is an organism that feeds on another organism called the host, while the parasite benefits, the host suffers. The association between a parasite and the host is called parasitism. Parasitism occurs in both plants and animals. In animals there are two types of parasitism: (1) Ectoparasites, (2) Endoparasites.
Ectoparasites live on the surface body of the host eg. Lice, thick, etc.
Endoparasites live on the inside of the host. Eg. Tapeworm, Liverflukes etc.
3. Symbiotic Feeding: This is the 3rd type of heterotrophic feeding we are to discuss. It is an association in which the organisms involved are benefitting from each other. Organisms involved in symbiosis are called symbionts. Symbiosis occurs both in Plants and animals. Examples of Symbiosis in animals are cellulos digesting bacteria found in the alimentary canal of the ruminant animal. Eg. The alimentary canal accommodates the bacteria, the bacteria digests the cellulose in the diet of ruminants.
Other examples of symbiosis is the sea anemone and the hermit crab.
The cattle and the cattle egret.
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