Levels of Organization of Organisms

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

Multiple Choice

Animals have a vascular systems that includes arteries and veins; Plants also have a vascular system that includes _____ and _____.

• Xylem and Phloem

• Xylem and Veins

• Arteries and Veins

• Phloem and Arteries

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

it is a group of organisms of the SAME SPECIES.

Example:

A pack of lions = same SPECIES in a group

A herd of sheep = same SPECIES in a group

A group of people = same SPECIES in a grou

POPULATION

is the sum of populations inhabiting a particular area.

Example:

1. Zebras, giraffes, and gazelles in the same area

2. Frogs, fish, and ducks in the same pond

Community

of all the biotic factors in a particular area together with the abiotic factors.

Example: water, fish, plants, trees, deer, bird, rock, air, sunlight,

​temperature

ECOSYSTEM

A collection of ALL ecosystems and it represents the zones of life on earth including land, water, and atmosphere.

BIOSPHERE

Multiple Choice

Which is the correct description of an community?

• A group of the same species living together

• A group of different species living together

• A group of abiotic and biotic factors in the same area

• All life on earth

Multiple Choice

Place the following from most specific to general

community, biosphere, population, ecosystem

• community, biosphere, population, ecosystem

• population, community, ecosystem, biosphere

• biosphere, ecosystem, community, population

• ecosystem, community, biosphere, population

Open Ended

In the box below type the following in the correct order from most complex to least complex:

Organism, tissue, atom, organ system, cell, organ