Different Modes of Nutrition in Animals Examples
It is always essential to know the basics of different modes of nutrition in all living organisms in order to understand the relationship between plants and animals and the related energy flow within the ecosystem.
The modes of nutrition in animals revolve around Holozoic, Parasitic, and Saprophytic.
These three types of nutrition is basically the sub category of heterotrophic mode of nutrition.
Heterotrophic mode of nutrition is further classified into these three types based on the pattern and class of food that is taken inside.
Let us understand these topics in detail.
Holozoic as the word suggests means the whole of animal and in this type the organism takes in the entire organic food and this can be in the form of whole body part, part of body organ or even whole grains or mix of grains.
By taking in the entire body parts the animal breaks these big macro molecules into simpler forms by means different digestive enzymes. Once the big molecules are broken down it is absorbed into the body cells of the organisms.
The steps that are followed for these breaking down and absorbing into the body cells are as follows: ingestion, digestion, absorption, assimilation and egestion.
We humans and other animals fall under this category of nutrition.
The second in line of nutrition modes is saprophytic.
In saprophytic mode of nutrition the organism draws the required amount of food from the rotten parts of dead organisms, rotten or food leftovers and even fallen leaves.
In this kind of nutrition the process is started from half or fully broken down macro molecules and is a kind of extra-cellular digestion which is most often carried out with through active transportation.
This active transportation is basically undertaken with the help of endocytosis.
The best examples of saprophytic mode of nutrition would be fungis and bacterias.
The last of the type of nutrition prevalent in animals is parasitic mode.
In parasitic mode of nutrition the organism derives the required food from the body of another organism.
The organism which is deriving the food from another is termed the parasite while the other as its host.
The parasite again could be of two distinct types, one which lives inside the host and the other which lives outside but is as dangerous.
The internal parasites usually infest and multiply inside the body cavity and most of the times are life threatening while the ones which lives outside but could play the role of vectors in spreading life threatening diseases.
Most common of internal parasites are worms or types of annelids while the external ones may include mostly fleas and insects as well as worms (leech).