Unicellular Organisms: Definition & Examples


Choose an answer and hit 'next'. You will receive your score and answers at the end.

question 1 of 3

Unicellular organisms are made of _____

Create Your Account To Take This Quiz

As a member, you'll also get unlimited access to over 79,000 lessons in math, English, science, history, and more. Plus, get practice tests, quizzes, and personalized coaching to help you succeed.

Try it risk-free
Try it risk-free for 30 days. Cancel anytime
Already registered? Log in here for access

1. Unicellular organisms can be

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

Create your account to access this entire worksheet
A Premium account gives you access to all lesson, practice exams, quizzes & worksheets
Access to all video lessons
Quizzes, practice exams & worksheets
Certificate of Completion
Access to instructors
Create an account to get started Create Account

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