Nutrition in Amoeba | Nutritional Mode | Organism Life Processes

An amoeba’s nutrition is accomplished through phagocytosis, a process in which the entire organism engulfs the food it intends to consume. Holozoic nutrition is the mode of nutrition in amoebae. It entails the consumption, digesting, and elimination of food.

Amoebae do not have a dedicated nourishment organ. With the help of pseudopodia, the entire process is carried out on the body surface.

What is an Amoeba?

Amoeba is a sort of cell or unicellular creature that can change shape, primarily through extending and retracting pseudopodia. Every main lineage of eukaryotic creatures contains an amoeba.

Amoeba Nutritional Mode

Amoeba obtains their sustenance by phagocytosis, a process in which the entire organism consumes the food it intends to consume. Holozoic nutrition is the process by which an amoeba consumes nutrients. It initiates the process of food ingestion, digestion, and egestion. Amoebae do not have any specialised feeding organs. With the help of pseudopodia, the entire process is carried out on the body surface.

Unicellular Organism Life Processes

  • A single-celled organism is known as a unicellular organism. All biological functions take place in a single cell, including reproduction, nourishment, digesting, and elimination. Some examples are amoeba, bacteria, and plankton.
  • A heterotrophic organism feeds on the waste of other creatures. A heterotrophic organism, on the other hand, must devour other organisms to survive.
  • Heterotrophic nutrition is seen in all species. Heterotrophic nutrition is used by the majority of bacteria and fungi.
  • Heterotrophic creatures, also known as heterotrophs, are organisms that feed in a heterotrophic manner. Humans, dogs, cats, deer, tigers, bears, lions, cows, and other heterotrophs are all heterotrophs. Heterotrophs include non-green plants such as yeast.
  • Heterotrophic nutrition includes holozoic nutrition.

What is Holozoic Nutrition and how does it work?

Holozoic Nutrition refers to the process by which creatures consume solid or liquid food inside their bodies. The following 5 steps are involved in obtaining nutrition:

  • Ingestion
  • Digestion
  • Absorption
  • Assimilation
  • Egestion

Amoeba Nutritional Process

The following are the several steps involved in holozoic nutrition in amoeba:


The process of ingesting food into the body, whether by swallowing or absorbing it, is known as ingestion. The pseudopodia of the amoeba are pushed out to encircle and devour the food, forming a food vacuole. Phagocytosis is the term for this process.


The process of digestion involves breaking down insoluble and big food molecules into soluble and minute molecules. The food vacuoles in amoeba are taken deeper into the cell, where the huge insoluble particles are broken down to the simplest molecules with the help of digestive enzymes.


The nutrients from the digested food material are absorbed into the cytoplasm of the cell while the undigested particles are left behind. Diffusion is the term for this process. Glycogen and lipids are accumulated as a result of the excess diet.


The process of acquiring energy from absorbed food molecules is known as assimilation. Absorbed food molecules are used by amoeba to generate the energy needed to carry out various life processes within the cell.


The process of evacuation of undigested dietary stuff is known as egestion. This is accomplished in an amoeba by rupturing the cell membrane and removing the undigested food particles from the body.

Points to Note:

  • Unicellular organisms are one-celled organisms in which all life processes take place within a single cell. Bacteria and amoeba are two examples.
  • In Amoeba, all life functions, such as reproduction, nourishment, digestion, and excretion, take place in a single cell.
  • The holozoic mode of nourishment is demonstrated by Amoeba.
  • Food is taken in by amoebas utilising pseudopodia, which are transient finger-like extensions.
  • Ingestion, digestion, assimilation, absorption, and elimination are the five major processes of Amoeba nutrition.


What is the digestion process in amoeba?

Food is digested in the food vacuole by the digestive enzymes.

What is nutrition in an amoeba?

Amoeba takes in food using temporary finger-like extensions termed as pseudopodia from the cell surface which fuse over the food particle forming a food-vacuole. In food vacuole, complex substances are broken down into simpler substances which then fuse into the cytoplasm. The undigested material is moved to the cell surface and thrown out.

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