Levels of Biological Organization
Background: In unicellular (single-celled) organisms, the single cell performs-all-life functions. It
functions independently. However, multicellular (many-celled) organisms have various levels of
organization within them. Individual cells may perform specific functions and also work together for the
good of the entire organism. The cells become dependent on one another.
Molecule
o Atom
Organelle VS
Protects by forming
a selective barrier
Breaks down food
for energy
Removes waste
Provides means of
transportation
Gives structural
support
Controls and
coordinates actions
Organ
system,
Organ
Cell
Activity 1: Use the descriptions on your handout to determine which level of organization (organelle,
tissue, organ, system, etc.) is being described. Write the level of organization in the parentheses
provided above the picture.
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Activity 2: After reviewing the different levels of organization, use your handout to help you fill in the
following chart by selecting the example that meets the requirement listed. (Hint: You will need to use
"epithelial tissue" twice to complete the chart).
Organelle
Tissue
Tissue
Organism
Organ
System
HELPPO?
L