Difference between Unicellular and Multicellular Organisms


 
 
Concept Explanation
 

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 

 

Sample Questions
(More Questions for each concept available in Login)
Question : 1

In a unicellular organism, A _______________ cell constitutes the whole organism.

Right Option : A
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Explanation
Question : 2

Which of the following organisms can change its shape?

Right Option : A
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Explanation
Question : 3

Which of the following has an irregular or variable shape?

Right Option : C
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Explanation
 
 
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