Unicellular Organisms: Definition & Examples

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question 1 of 3

Unicellular organisms are made of _____

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1. Unicellular organisms can be

2. _____ unicellular organisms can be seen by the naked eye.

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About This Quiz & Worksheet

Unicellular organisms are uniquely designed to carry out all of the necessary life functions as a single-celled individual. This lesson and worksheet/quiz combination will review the main characteristics of unicellular organisms and introduce you to some of the most commonly studied examples.

Quiz & Worksheet Goals

In this lesson you will become familiar with the following characteristics of unicellular organisms:

  • Number of cells in a unicellular organism
  • Biological classification of unicellular organisms
  • Instruments used to view unicellular organisms
  • Structures of unicellular organisms
  • Life processes achieved by unicellular organisms

Skills Practiced

This quiz and worksheet will test the following skills:

  • Defining key concepts - know that unicellular organisms carry out all life functions as an individual cell
  • Information recall - identify the whip-like structure used by Euglena
  • Distinguishing differences - understand that the majority of unicellular organisms are microscopic in contrast to many multicellular organisms
  • Reading comprehension - know the biological classification for unicellular organisms

Additional Learning

To learn more about single-celled organisms, review the accompanying lesson called Unicellular Organisms: Definition & Examples. This lesson addresses the following objectives:

  • Compare the structures in common unicellular organisms
  • Describe the size of most unicellular organisms
  • Classify unicellular organisms into biological kingdoms
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