is symbiotic neutralism heterotrophic mode of nutrition?

Solution:

Symbiosis can be referred to as a sub-type of heterotrophic mode of nutrition. 

Symbiosis is an interaction between two different organisms living in close association in which both the partners get mutually benefited. Symbiosis is also called mutualism. Lichen, which is a combination of an alga and a fungus, is a typical example of symbiotic association. 
Lichens in which two organisms algae and fungi remain in close association and benefit each other. Algae provide food to the fungi and fungi provide shelter, minerals and nutrients to the algae.

Heterotrophic nutrition is a type of nutrition in which the organisms cannot prepare their own food and depend upon other organisms for the source of nutrition. Except for green plants all other organisms are heterotrophs. There are many types of heterotrophic nutrition like:
 
Holozoic – the mode of nutrition in which organisms intake complex food materials and are broken down into simpler forms by the specific digestive system of organism. E.g. Human.
 
Saprophytic – The mode of nutrition in which organisms obtain nutrition on dead and decaying matters is known as saprophytic nutrition. E.g. Fungus.
 
Parasitic – It is the mode of heterotrophic nutrition in which an organism lives inside the body of another organism called host and obtain nutrition from the host. E.g. Plasmodium
 
Symbiotic – In this mode of nutrition two organisms survive by depending upon each other without causing any harm to any of the members. E.g. lichen.
 

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