Grade 5 Science
Levels of Organization
Identifying cells, tissues,
organs, organ systems,
organisms, populations,
communities, and ecosystems
as levels of organization in the
biosphere.
The following slides
explain the levels of
organization from Cells
to Biospheres
Cells
• A structural unit of all living things. The
smallest unit classified as an living
organism.
Tissues
• Tissues are an
ensemble of cells,
they are not the same
but the are of the
same origin, that
carries out an
function.
Organs
• Organs are groups of tissue that perform
different functions. There are many organs
in the body like skin, kidney, liver, and etc.
Organ Systems
Some types of organ systems are,
Circulatory, Respiratory, Digestive,
Nervous, and Reproductive.
Organism
• A single living organism. Example:
Humans, Cows, Birds, Trees.
Population
• A group of organisms of one type
staying in the same area. An example is
like and herd of cows on a plain, or the
number of people living in Tuscaloosa.
Community
• Different populations that live together.
Examples: Cows, snakes grass, hawk.
• They must all be LIVING Things
• The community below includes the horses,
cows, chickens & dogs
Ecosystems
• These include the living & nonliving things
found in the community (people birds
water soil dogs etc.
• Two examples of Ecosystems are
wetlands and forests.
Biosphere
• Our Biosphere is made up of all of the
biomes/ ecosystems on the planet earth.
Questions
Test your
Knowledge
A Pod of bottlenose dolphins living in
a specific region can be identified as
which level of organization?
•
•
•
•
A. Biosphere
B. Ecosystem
C. population
D. community
C population
A population is a group of organisms of one
type that all live in the same area.
Study the picture below
Which level of organization is BEST represented by the entire picture?
•
•
•
•
A. Organism
B. ecosystem
C. population
D. community
B ecosystem
• An ecosystem is a community and its
nonliving surroundings as labeled here
Air
Bird
Trees
Bushes Grass
Water
Alligator
Fish
A group of cells that work together for
a common function would MOST
LIKELY be described as
•
•
•
•
A. a tissue
B. an organ
C. an organelle
D. a community
A. a tissue
A tissue is a small group of cells used to make
up organs such as the brain
Study the picture below
•
•
•
•
A. Biosphere
B. Ecosystems
C. Populations
D. community
Which level of biological organization results from the
combination of the living organisms shown in the
picture?
D. community
A community is all living things (plants and
animals) that live in a defined area
Which figure BEST represents the
levels of organization in the ocean
from largest to smallest?
A. Community
B. ecosystem
Organism
community
Ecosystem
population
Population
organism
C. organism
population
community
ecosystem
D. population
ecosystem
organism
community
B. Ecosystem, Community, Population, Organism
Ecosystem, Community, Population, Organism is the
levels of organization in descending order
Which sequence correctly identifies the
levels of organization in a biosphere from
most complex to least complex?
•
•
•
•
A OrganismPopulationCommunityEcosystem
B ecosystemcommunitypopulationorganism
C communityorganismecosystempopulation
D populationecosystemorganismcommunity
B. ecosystemcommunitypopulationorganism
• An ecosystem is a community and all its
surroundings making it the most complex and
an organism is one living object making it the
simplest
Study the tables below. Ospreys, egrets and cranes were observed in an area
around a small oxbow lake at Perry Lakes Park in Alabama
Birds observed during one year
Bird
Number
observed
Osprey
63
Egret
85
Crane
22
Which student correctly categorized the
observations according to the levels of
organization in the biosphere
Student
Organisms
Population(s)
Communities
1
3
3
1
2
3
1
3
3
170
3
1
4
170
1
3
A Student 1
B Student 2
C student 3
D student 4
C student 3
Since an organism is a single living thing
you have to include all of them so
63+85+22=170 and a population is only
one type of animal and three birds were
being studied there were 3 populations
and since a community is all the
populations combined there is only 1
community
Study the Diagram below
Forests, animals, sunlight, soil, water
Oak forest, grey squirrels, deer
Oak forest
Oak tree
Which example below represents the organizational levels shown in the diagram?
• A Organism
B ecosystem
Population
community
C Community
D Population
Ecosystem
Organism
Community
population
Organism
Ecosystem
Ecosystem
organism
Population
Community
B
ecosystem
community
population
organism
An ecosystem is a community and its
nonliving surroundings. Communities are
populations in a defined area. Populations are
groups of organisms. An organism is a single
living thing.
10
• Study the picture
Hint: This includes the
water ,soil, animals &
trees.
Which level of organization is BEST represented by the entire picture?
This includes the water ,soil, animals & trees.
A: Population
B: Community
C: Ecosystem*
D: Organism
• C. Ecosystem, because it is made up of
the living & non living things.
11
• A scientist studied a coral reef in an
ocean. The scientist made a data table to
record what was observed. How many
populations are represented by the data?
A: 2
B: 6
C: 67
D: 101
• The answer to that question is B. 6
• It asked how many populations, and
there are 6 populations. (Sea turtle, Sea
Star, Nurse Shark, Clown Fish, Parrotfish,
Sea urchin. Each TYPE is a different
population.
• The population of a town is the number of
people that live there.
12
Study the list of terms below.
: osteocyte
: stomach
: muscle
:digestive system
Hint: This word ends in cyte
which means CELL
• A student preparing for a test in
human anatomy studied the
terms in the list. Which of the
following represents a tissue in
the human body?
A: Bone Cell
B: Stomach
C: Muscle
D Digestive System
• The answer to that question was
C. Muscle
Muscle is made up of cells that are
similar to each other
• because the stomach is an organ
• an osteocyte is a bone cell
• the digestive system is a whole system.
13 : Student Question
A herd of animals in the same area is an example of,
A. Population
B. Biosphere
C. Organism
D. Ecosystem
• The answer is A. population
• because, a population is a group of
organisms of one type staying in the
same area.
Great
Job!!!