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

Based on the number of  cells organisms can be differentiated in ______________________.

Right Option : D
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Question : 2

Which of the following are correct /

(a) The unicellular organisms have evolved earlier around 3.5 thousand years ago .

(b) Amoeba, bacteria ,paramecium are the examples of Multicellular organisms

Right Option : A
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Explanation
Question : 3

________________________ organisms have evolved earlier around 3.5 thousand million years ago.

Right Option : A
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Explanation
 
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