what is Difference between unicellular and multicellular organism?

Difference between unicellular and multicellular organism

Unicellular organisms

Amoeba and paramecium are examples of unicellular animals will Chlamydomonas is a unicellular plant.


It is a unicellular animal found in fresh water ponds and stagnant pools. It does not possess any permanent shape and keeps on changing it.

Its cytoplasm contains a nucleus, a contractile vacuole and many food vacuoles. It moves from one place to another with the help of finger like projections called pseudopodia. Amoeba feeds on small organism and food particles found in the water. It digests them inside food vacuoles.


Chlamydomonas is a unicellular green plant, which is found in the fresh water and stagnant pools. It is pear shaped. In the posterior part it has a cup shaped chloroplast, which helps the plant to prepare food by photosynthesis. It moves with the help of flagella. The cytoplasm contains a spherical nucleus, which controls all the functions of the plants.

Multicellular Organisms

There are so many multicellular organisms around us. Can you name some of them? Rabbit, human being and rose plant are some examples of these organisms. There are shoot and roots system in the flowering plant. Shoot system prepares the food for the plants and transports it. Root system observes water and salts from the soil and transports it to other parts of the plants.

Different systems found in the human being and rabbit are digestive system, respiratory system, excretory system, circulatory system etc. these systems perform different function in an organized.

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