Question

an amoeba is called unicellular organsim, why?

Answer 1

Answer:

because amoeba is a single cell organism and its all functions by itself so it is called a unicellular organism.

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Answer 2

AMOEBA :

• It is called unicellular organism because it is composed of single cell.
• All the life processes of Amoeba take place within that single cell.
• It is a kind of Protozoan .
• It does not have a definite shape.
• It reproduces by Binary Fission.
• It obtains its food with help of small finger like projections called pseudopodia and forming a food vacuole.

Extra information:

Nutrition in Amoeba:

• Ingestion : Intake of food occour by temporary finger like projections called pseudopodia which fuse over food to form food vacuole.
• Digestion: Inside food vacuole it releases enzymes that break complex food into simpler form.
• Absorption: The digested food is diffused into cytoplasm.
• Assimilation: The absorbed food is utilised to meet energy requirements.
• Egestion : The remaining undigested material is thrown out by cell by phagocytosis.

Note: This five step nutrition is called Holozoic Mode of nutrition.