Multicellular and Unicellular Organisms

Levels of Organization in Organisms

How can the levels of organization in plants and

animals be described?

Introduction to Levels of
Organization

●Today, we'll explore how plants and
animals are organized.

●We'll learn about cells, tissues, organs,
and organ systems.

●Let's dive into the building blocks of life!

What is Matter?

●Everything around you is made of matter.

●Matter is made of atoms, which combine
to form molecules.

●Molecules combine to form cells, the
smallest unit of life.

Unicellular vs. Multicellular

●Unicellular organisms are made of one cell (e.g., amoebas,
algae).

●Multicellular organisms are made of many cells (e.g., humans,
plants).

●Multicellular organisms have more complex life processes.

Multiple Choice

You are a multicellular creature.

• True

• False

Hierarchical
Organization

●Scientists use hierarchical organization to
study ecosystems.

●This system starts with the simplest level
and becomes more complex.

●Each level has a specific role in the
organization.

Cells: The Building
Blocks

●Cells are the lowest level of organization.

●Multicellular organisms have many
different types of cells.

●Cell differentiation allows cells to become
specialized.

Multiple Choice

Unicellular organisms are larger than multicellular ones.

• True

• False

Types of Animal Cells

●Muscle cells, nerve cells, blood cells, bone cells, and skin cells.

●Each type of cell performs a specific job for the organism.

●Example: Muscle cells help in movement.

Types of Plant Cells

●Plant cells also differentiate into various
types.

●Examples: Cells for making food, storing
food, protecting the plant.

●These cells become parts of stems,
leaves, flowers, or roots.

Tissues: Groups of
Cells

●Tissues are groups of similar cells working
together.

●Animal tissues: muscle, connective,
nervous, epithelial.

●Plant tissues: dermal, vascular, ground.

Animal Tissues

●Muscle tissue causes movement.

●Connective tissue provides structure and support.

●Nervous tissue carries messages to and from the brain.

●Epithelial tissue forms protective layers.

Multiple Choice

Which of these is NOT a type of animal tissue?

• muscular

• nervous

• vascular

• connective

Plant Tissues

●Dermal tissue provides protection and
reduces water loss.

●Vascular tissue transports water and
nutrients.

●Ground tissue provides storage and
support, and is where photosynthesis
occurs.

Organs: Groups of
Tissues

●Organs are groups of different tissues
working together.

●Example: The heart is made of muscle,
epithelial, nervous, and connective
tissues.

●Each tissue type performs a specific
function for the organ.

Multiple Choice

What are organs made of?

• organ systems

• amoebas

• organs

• tissues

Plant Organs

●Plant organs include leaves, stems, and roots.

●Leaves are specialized for photosynthesis.

●Each leaf contains dermal, ground, and vascular tissues.

Organ Systems

●Organ systems are groups of organs
working together.

●Example: The digestive system includes
the stomach, intestines, and liver.

●These organs work together to break
down food and absorb nutrients.

Plant Organ Systems

●Plants have two major organ systems:
shoot system and root system.

●Shoot system includes leaves, stems, and
flowers.

●Root system absorbs water and nutrients,
and anchors the plant.

Organisms: The Highest Level

●An organism is the highest level of organization.

●Multicellular organisms have many organ systems working
together.

●Each system depends on the others for the organism's survival.

Drag and Drop

Organs systems are made of​

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. Organs are made of ​

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. Tissues are made of ​

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. All together these things can make up an ​

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.

Drag these tiles and drop them in the correct blank above

organs

tissues

cells

organism