Difference between Unicellular and Multicellular Organisms
Difference Between Unicellular and Multicellular Organisms
Based on the number of cells organisms can be differentiated into two types :- Unicellular and Multicellular.
The main differences between the two type of cells are listed below in the table.
Unicellular organisms |
Multicellular Organisms |
|
|
Definition |
These are formed of single cell. | These are formed of more than one cell. |
| Cell size | 10 - 100 micrometers | 5 - 10 micrometers |
| Origin | They have evolved earlier around 3.5 thousand million years ago. | They have evolved from unicellular organisms 1.2 thousand million years ago. |
| Cellular organization | Cellular organization can be observed | No true cellular organisation |
| Cell differentiation/ Tissue forming | Present | Absent |
| Reproduction and spindle formation | Mostly binary fission without spindle formation | Take place through mitosis or meiosis with spindle formation |
| Nitrogen fixing ability | Present | Absent |
| Genetic material | In cytoplasm as circular DNA | In nucleus as linear DNA |
| Examples |  |
 |
In a unicellular organism, A _______________ cell constitutes the whole organism. | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following organisms can change its shape? | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following has an irregular or variable shape? | |||
| Right Option : C | |||
| View Explanation | |||
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