Nutrition in Amoeba - Class 10 PDF Download

Amoeba is a unicellular and omnivore organism.

•  It eats plants and animals as food which floats in water in which it lives.
• The mode of nutrition in amoeba is holozoic.
• The process of obtaining food by amoeba is called phagocytosis(cell feeding)

Various steps involved in the Nutrition of Amoeba they are as follows

Ingestion:- Amoeba has no mouth or adher organ for intake of food. It ingest food particles by forming temporary finger-like projections pseudopodia. Schedule courier fuse over the food particles to form a food vacuole.

Digestion:- Inside the food vacuole, complex food breaks into small soluble molecules.
This food is digested in the food vacuole by digestive enzymes.
The enzymes from surrounding cytoplasm enter into the food vacuole and break down the food into small and soluble molecules by chemical reaction.

Absorption:- The digested food present in food vacuoles of amoeba is absorbed directly into the cytoplasm of amoeba cell by diffusion.
This process of absorption by the cytoplasm is called as absorption.
The digested food just spreads out from the food vacuole into the whole amoeba cell.
After absorption of food the food vacuole disappears.

Assimilation:- A part of the food absorbed in the amoeba cell is used to obtain energy through respiration.
The remaining part of absorbed food is used to make the parts of amoeba cell which lead to the growth of amoeba.
Thus on assimilating food amoeba grows in size and then amoeba can reproduce by dividing into two daughter cells.

Egestion:- The remaining undigested food material is removed by the amoeba cell membrane, which rupture suddenly at any place and eliminates out the undigested food. This process is called egestion.