Levels of Organization With QUIZ

What makes
up an
organism?
Life is organized into different levels
based upon size (from small to large).
There are 5 Levels of
Organization in Multicellular
Organisms:
• 1. Cells
• 2. Tissues
• 3. Organs
• 4. Organ Systems
• 5. Organisms
The cell is the basic
unit of life. The paramecium above is
made of only one cell and it
must perform all the jobs of
Cells are specialized the organism.
by size and shape for

the job they do.
Example: skin cell

Organisms and Cells
• Some organisms are unicellular.
– This means they are made of only one cell.
– Examples: bacteria, yeast
• Some organisms are multicellular.

– This means they are made of many cells.
– Examples: humans, trees
Organisms and Cells
• Unicellular organisms have nothing but a
single cell.
• However, multicellular organisms have

many more levels of organization to make
sure the whole body can work correctly,
even when it is doing many things at the
same time.
T I S S U E S
Tissues are made of the same type of cells
grouped together to do a specific job.
Example: Humans have four kinds of tissue in their

Bodies: Epithelia, Muscle, Connective, and Nerve.
Organs
Organs are made up of different tissues
that work together to do a job.
Example: a heart
is an organ .
Organs
Plants have organs too!
LEAVES, STEMS, ROOTS…!!!!
Organ Systems
An organ system is a group of
organs working together.
Examples:
•Human organ systems include circulatory,
reproductive, digestive, nervous, respiratory.
• Plantorgan system-roots, stems, leaves=

transport system.
Organisms
All cells, tissues, organs and organ
systems working together makes an
organism.
Example: a human
Levels of Biological Organization
Populations
Organisms
Organ Systems
Organs
Tissues
Cells
Levels of Biological Organization
Populations
Organisms
Organ Systems
Organs
Tissues
Cells
Ecology—the scientific study of interactions between
different organisms and between organisms
and their environment or surroundings
Biotic—living factors that influence an ecosystem
Abiotic—non-living factors that influence an

ecosystem
Producers
A. Sunlight is the main energy source for life on
earth
B.Also called autotrophs
C. Use light or chemical

energy to make food
1. Plants
2. plant-like protists (algae)
3. Bacteria
D. Photosynthesis—use light energy to convert carbon
dioxide and water into oxygen and carbohydrates
Light Energy
(Remember: 6CO2 + 6H2O 6O2 + C6H12O6)
E. Chemosynthesis—performed by bacteria, use

chemical energy to produce carbohydrates
Consumers
A.Organisms that rely on other organisms
for their energy and food supply
B. Also called heterotrophs
Herbivores—obtain energy
by
eating only plants
Carnivores—eat only
animals
Omnivores—eat both plants and animals
Decomposers—breaks down dead organic matter

Feeding Interactions
A. Energy flows through an

ecosystem in one direction—
from the sun or inorganic
compounds to autotrophs
(producers) and then to
heterotrophs (consumers)
B. Food Chain—series of steps in which organisms
transfer energy by eating and being eaten
1. Arrows go in the direction of how energy is

transferred
2. Start with producer and end with top consumer

or carnivore
Ex: grass cricket frog
raccoon
C. Food Web—network of food chains within an ecosystem
Hawks
Weasels Raccoons
Mice
Grass
Which of the organisms above is the producer?

Which of the organisms above is the top consumer?
D. Trophic Levels—each step in a food chain or food web
1. Level 1—Producers (autotrophs)
2. Level 2—Primary Consumers (herbivores)
3. Level 3—Secondary Consumers

(carnivores or omnivores)
4. Level 4—Tertiary Consumers

(carnivore—usually top carnivore)
IV. Ecological Pyramids
Diagram that shows the relative amount of energy or
organisms contained within each trophic level of a food
chain or web
1. The parts of a plants
are the
a.r_ _ ts
b.st_ _ s
c.l_ _ _es
d.fl_ _ _ers
2. What do plants need
to make their own food?
a. c _ _ _ _on dioxide from the _ _ _

b. w _ _ _ _
c. l _ gh_ from the _ _ _
a.carbon dioxide from the air
b.water
c.light from the Sun
1.Which of these describes the sun?
A.composed of light and gases
B.composed of hard rocks
C.does not emit light and heat
2. Which of these is not given off by the sun?

A.Chemical energy
B.Heat Energy
C.Light Energy
3. What kind of heavenly body is the sun?

A. Meteor
B. Planet
C. Star
4. Which of these makes the earth warm?
A. Heat energy
B. Light energy
C. Both A and B
5. Which of these is used by green plants for food making?

A.Heat Energy
B.Light Energy
C.Solar Energy
6. What is the color of the sun?

A.white
B.orange
C.blue
7. Which of these is the cold area in the sun?

A.Prominence
B.Sunspot
C.Both A and B
GIVE the functions of the
following organs in our body:
1.Heart
2.Lungs
3.Kidneys
4.Brain
5.Skin
ANSWER THE FOLLOWING
QUESTIONS:
1.What will happen to the earth if the

sun disappear?
2.Give two benefits of the sun to us.
3.What are the harmful effects of the
sun to humans?
CELL EARTH ORGANISM
ORGAN SUN PLANTS
1.Basic unit of life

2.Main source of energy in our planet.
3.The planet where we lives in.
4.It can be a plant, animal, bacteria or humans.
5.They use sunlight to create their own food.
Omnivores Carnivores Organisms
Herbivores Producers Consumers
1. Type of consumer that eat plants

2. Type of consumer that eat meat
3. Type of consumer that eat meat and plants
4. They can create their own food
5. They cannot create their own food
1. Who is the producer?
2. Why?
3. Who is the top consumer?
4. Why?
5. Which of the organisms above
absorb highest amount of energy
from the sun?
V. Ecological Interactions between organisms
A.Competition—when two organisms of the same or

different species attempt to use an ecological resource in
the same place at the same time.
Ex: food, water, shelter
Monkeys compete
with each other and
other animals for food.
Rams compete with

each other for mates.
B. Niche—the ecological niche involves both the
place where an organism lives and
the roles that an organism has in its habitat.
Example: The ecological niche of a sunflower growing in the
backyard includes absorbing light, water and nutrients
(for photosynthesis), providing shelter and food for other
organisms (e.g. bees, ants, etc.), and giving off oxygen
into the atmosphere.
C. Predation—one organism captures and feeds on
another organism
1. Predator—one that does the killing
2. Prey—one that is the food
D. Symbiosis—any relationship in which two
species live closely together
1. Mutualism—both species benefit (+,+)
a. Ex: insects and flowers
Can you think of any other examples that we’ve talked about in class?
2. Commensalism—one member of the association
benefits and the other is neither
helped nor harmed.
(+,0)
Example: barnacles on a whale
The Remora fish attaches to
the shark and gets a free ride.
Commensalism
Birds build nests in trees.

3. Parasitism—one organisms lives on or inside
another organism (host) and harms it.
The parasite obtains all or part of its nutritional
needs from the host. (WIN-LOSE)
Example: fleas on a dog
Parasitism
Mosquito
biting a
human.
Mutualism, Commensalism or Parasitism??

Levels of Organization With QUIZ

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What makes

by size and shape for

Example: skin cell

• Some organisms are multicellular.

• However, multicellular organisms have

Example: Humans have four kinds of tissue in their

• Plantorgan system-roots, stems, leaves=

Abiotic—non-living factors that influence an

B.Also called autotrophs

C. Use light or chemical

E. Chemosynthesis—performed by bacteria, use

Decomposers—breaks down dead organic matter

A. Energy flows through an

1. Arrows go in the direction of how energy is

2. Start with producer and end with top consumer

Which of the organisms above is the producer?

1. Level 1—Producers (autotrophs)

2. Level 2—Primary Consumers (herbivores)

3. Level 3—Secondary Consumers

4. Level 4—Tertiary Consumers

a. c _ _ _ _on dioxide from the _ _ _

2. Which of these is not given off by the sun?

3. What kind of heavenly body is the sun?

5. Which of these is used by green plants for food making?

6. What is the color of the sun?

7. Which of these is the cold area in the sun?

1.What will happen to the earth if the

1.Basic unit of life

Herbivores Producers Consumers

1. Type of consumer that eat plants

A.Competition—when two organisms of the same or

Rams compete with

Birds build nests in trees.

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