Question

What is difference between unicellular and multicellular

Answer 1

he unicellular body is formed by single cell while body of Multicellular is of multiple cells.

In unicellular organism the work is divided at the organelle level, while in Multicellular it involves cellular, tissue, organ and organ system level.

In unicellular organism a single cell is responsible tocarry the life, while in Multicellular organism special cells are focused to carry out distinct cellular duties.

From all sides the cell of a unicellular organism is exposed to the environment while in Multicellular organism the outer cell face the environment and the inner cells are specialized to do the cell basic function.

In unicellular organism a simple cellular trauma can cause its death while in Multicellular organism it does not cause the death of the tissue.

In unicellular organism the cell body cannot attain a large size, due to surface area volume ratio while Multicellular can.

In unicellular organism the life span is short due to heavy load work while in Multicellular life span is long.

In unicellular organism the power of division is not lost but in Multicellular organism some non reproductive specialized cells lose this power.

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Answer 2

Multicellular organisms are those which are made up of many cells. Humans are multicellular. Multicellular organisms can be much larger and more complex. This is because the cells of the organism have specialised into many different types of cells such as nerve cells, blood cells, muscle cells all performing different functions.

Some living organisms are made up of once cell only, these are called unicellular. These organisms have a large surface area to volume ratio and rely on simple diffusion to meet their needs. An example of a unicellular animal is Amoeba.


All seven life processes take place inside this one cell. Amoebas are found in ponds and ditches. They move by changing their shape, they push out pseudopodia in the direction they want to move and the rest of the cell flows after them. Amoeba feed on smaller organisms such as bacteria. The pseudopodia flow around the food engulfing it, the food is then taken into the cytoplasm in a food vacuole.