Characteristics
of living things
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some examples of living things in
the picture below are trees , grass,
birds, a farmer, a dog and a cow .
Although they look and behave
differently they all have one thing in
common .
Being alive !
There are 5 main
characteristics of living
things
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1- Made of cells
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All living things are made of cells.
What is a cell?
A cell is the smallest unit of living things.
A cell is the building block of living things.
The cell is a membrane like structure that
contains all the materials necessary for
life .
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Even You are made of small building
blocks called cells
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Some organisms are composed
of only ONE CELL
These organisms are called
UNICELLULAR OEGANISMS .
They can only be seen with a
microscope .
Examples of these organisms are :
Amoeba and Bacteria
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Multicellular organisms
Some organisms like Humans are made of
trillions of cells.
Any organism that is composed of more than
one cell is called Multicellular organism.
!
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Each group of cells in a multicellular
organism has its own shape , size , and
function.
Different groups of cells work together
to keep the organism
.alive
.
Group of
muscle cells !
Group of
skin cells
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I’m a
Prison
Cell! 
2-Respond to stimuli
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If the flash of
a camera
Goes off near
your eyes
• You will respond
(react) to the bright
light by blinking .
• The flash of light
stimulated your
blinking
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What is a stimulus?
• It’s any change that affects the living organism
• A reaction towards this change is called
Response .
Click on the button to
learn more about
stimulus and response
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Homeostasis
Maintaining stable internal conditions to
survive .
Example : Body Temperature and Heart
beats
Click on the picture to
learn more about
homeostasis
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3- Reproduction
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3-Reproduction
•
The process of making new copies of an
organism through passing copies of all or
part of the parents’ DNA to their offspring
(children).
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DNA, or deoxyribonucleic acid, is the
genetic material that controls the structure
and function of cells.
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Sexual Reproduction
Asexual Reproduction
1- Only One Parent
1-Two parents are involved .
(Male and female )
2-Offsprings receive the
same exact copy of DNA
from their parent.
2-Offsprings receive part of
The DNA from each parent
3-Offsprings look exactly
like their parent
3-Most animals and plants
Reproduce by sexual
reproduction
Ex: Amoeba by Binary
Fission
Hydra
by Budding
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Hydra
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Most Unicellular organisms and some plants
reproduce Asexually
• Hydra : it’s a simple multicellular animal
that lives in sea water .
• Hydra Reproduces by “Budding:
1- A small bud appears on the side
2-The bud grows looking exactly like its
parent
3-The bud breaks off
4-The new offspring separate and get
carried By the water where it settles
some
Place else
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Binary Fission
Amoeba and Bacteria reproduce
asexually by a process called Binary
Fission
In Binary fission the cell grows and then
splits into two identical cells
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4- Need energy
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Living things need energy to
1-carry out the activities of life.
2- make or break down food.
3- move materials into and out of cells
4- build and repair cells.
5- move and to interact with each other.
All living things need Food to get energy
BUT HOW DO
ORGANISMS GET
THEIR
FOOD ?
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Living things are divided into
three groups according to
how they obtain nutrients
1-Producers
2-Consumers
3-Decomposers
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1-Producers
Producers : they (produce) make their own
food using the sun’s energy.
• A producer could be a plant or green algae.
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2-Consumers
Consumers : They (Consume) Take in
food.
A consumer could be
Herbivore
Carnivore
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Omnivore
3-Decomposer
• They break down dead plants and animals
into simple useful materials that the soil
can use.
• Examples: Bacteria ,Fungi and some
Worms.
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5-Grow and Develop
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• All living things grow during some
period of their lives.
• When a unicellular organism grows, it
gets larger and then divides, forming
two cells.
•
•
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When a multicellular
•organism grows, the
number of cells in its
body increases, and
the organism gets
bigger.
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Credits
•
https://www.youtube.com/user/AmoebaSisters
•
https://www.youtube.com/watch?v=h6-evXswaQs
•
http://freedesignfile.com/
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