Levels of Organization

Levels of Organization

Today we are going to look at the different levels of organization and how they build upon one another.

Life is organized into different levels based upon size (from small to large).

Organisms and Cells

• Some organisms are unicellular. This means they are made of only one cell. Ex: bacteria, yeast

• Some organisms are multicellular. This means they are made of many cells. Ex: humans, trees

Multiple Choice

Which of the following is the correct order of organization in living things from most basic (simple) to most complex?

• organism, cell, tissue, organ, organ system

• organ system, organ, tissue, cell, organism

• cell, tissue, organ, organ system, organism

• cell, organ, tissue, organism, organ system

Cell

• The smallest unit of life (building blocks of life)

• Cells are specialized by size and shape for the job they do.

• Example: nerve cell, also called a neuron

Multiple Choice

The basic unit of structure and function of living organisms

• organ

• organ system

• cell

• tissue

• organism

Tissue

• The same type of cells grouped together that are working together to do a specific job.

• Ex: nerve tissue, muscle tissue

Multiple Choice

A group of similar cells that work together to form the same function is called .......

• organ

• cell

• organ system

• organism

• tissue

Multiple Choice

What is the difference between a cell and a tissue?

• cell is basic unit of life; tissue is group of cells that work as one

• cell is group of tissues; tissue is basic unit of life

• cell is basic unit of life; tissue is groups of different cells

• cell is group of organs; tissue is group of different cells

Organ

• A bunch of tissues working together to do a job.

• Ex: brain, heart

Multiple Choice

A structure that is composed of different kinds of tissues

• organ

• cell

• organ system

• organism

• tissue

Organ System

• A bunch of organs working together

• Ex: nervous system, circulatory system, digestive system, etc.

Multiple Choice

A group of organs that work together to perform a major function....

• organ

• cell

• organ system

• organism

• tissue

Organism

• All cells, tissues, organs, and organ systems working together makes an organism.

• Ex: human, animal

Multiple Choice

Any living thing made up of one or more cells....

• organ

• cell

• organ system

• organism

• tissue

Levels of Organization

When we look at the levels of organization, we must remember the order in which they are listed. Cells are the basic units of life, and when cells come together they form tissues, and so on.

Multiple Select

Please choose from the options below, which are levels of organization.

• cells

• organ

• face

• skin

• tissue