Unicellular and Multicellular


 
 
Concept Explanation
 

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.
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Sample Questions
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Question : 1

____________________ organisms are formed of single cell.

Right Option : A
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Question : 2

Which of the following are correct :

(a) Multicellular organisms are formed of single cell.

(b) Cellular organization can be observed in unicellular organisms.

(c) Multicellular organisms have evolved from unicellular organisms 1.2 thousand million years ago.

Right Option : B
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Explanation
Question : 3

The example of unicellular organism are _____________________ .

Right Option : B
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Explanation
 
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