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Levels of Biological Organization
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Levels of Biological Organization
Part 1: Multiple Choice
1. Which level is the smallest level of organization in a living thing?
Organ
Cell
Organ system
Organism
2. A group of similar cells working together forms a ________.
tissue
population
community
biosphere
3. Which level includes all the organs that work together to perform a major function?
Cell
Tissue
Organ system
Ecosystem
4. Which sequence shows levels from simplest to most complex?
Organ, cell, tissue, organism
Cell, tissue, organ, organ system
Ecosystem, community, population, organism
Organ system, organ, tissue, cell
Part 2: Match the Levels
Match each level on the left with its description on the right. Write the correct letter on the line.
5. Organism: ______
6. Population: ______
7. Community: ______
8. Ecosystem: ______
A. All the living and nonliving parts of an area
B. One individual living thing
C. All the different populations living in an area
D. Members of the same species living in an area
Part 3: Explain Your Thinking
9. Explain how cells, tissues, organs, and organ systems work together to help an organism function as a whole living system.
10. Put these levels in order from simplest to most complex: ecosystem, organ, cell, organism, tissue, organ system.
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