Question
Unicellular organisms differ from multicellular ones. How?
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Answer
| Unicellular Organisms | Multicellular Organisms |
| The body of the unicellular organism is composed of a single cell. | The body of the multicellular organism is composed of numerous cells. |
| Irregular in shape. | Have a definite shape. |
| Simple body organization. | Complex body organization. |
| A single cell is responsible to carry the life processes. | Different cells are specialized to perform different functions. |
| The total cell body is exposed to the environment. | Only the outer cells are exposed to the environment. |
| Division of labour is at the organelle level. | Division of labour is at cellular, tissue, organs and organ system level. |
| Includes both eukaryotes and prokaryotes. | Includes only eukaryotes. |
| A lifespan of a unicellular organism is usually short. | These multicellular organisms have a longer lifespan. |
| Injury to the cell leads to the death of the organism. | Injury to a cell does not cause the cell to die in a multicellular organism. |
| Reproduce by asexual reproduction. | Reproduce by sexual reproduction. |
| Cell differentiation is absent. | Cell differentiation is obvious. |
| They can be autotrophs or heterotrophs. | They include both autotrophs and heterotrophs. |
| They are microscopic in nature. | They are macroscopic in nature. |
| All forms of bacteria, amoeba, paramecium yeast, are examples of unicellular organisms. | Human beings, animals, plants, birds, insects, are a few examples of multicellular organisms. |
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