How are Plant Cells and
Animal Cells Different?
How is Mitosis Different in Plant
Cells?
• Plant cells do not have centrioles.
• Plant cells do Not do Cytokinesis. Instead
they form a cell plate.
Centrioles
• Animal cells contain Centrioles but plant
cells do not.
Cell Walls
• Plant cells have cell walls and animal cells
do not.
Vacuoles
• Plant cells have large vacuoles.
• Animal cells have small vacuoles.
Shape
• Plant cells usually have a rectangular
shape.
• Animal cells are usually round.
CELL PROCESSES
DIFFUSION
&
OSMOSIS
&
ACTIVE TRANSPORT
What is DIFFUSION?
Diffusion is the process of
molecules moving from an
area of high concentration
(DENSE) to an area of low
concentration (LESS DENSE).
Does it end?
Diffusion ends when molecules
are evenly distributed on both
sides of the cell membrane.
How does diffusion
help a cell?
Cells can get important substances.
(oxygen,H2O, nutrients)
Cells can get rid of wastes.
(CO2, H2O, nitrogen)
How does diffusion
occur in a cell?
In living cells materials pass
through small holes called
PORES in the cell membrane
CELL MEMBRANE
MOLECULE
HIGH
LOW
MOLECULES MOVE OUT OF THE CELL! HIGH TO LOW
CELL MEMBRANE
MOLECULE
LOW
HIGH
MOLECULES MOVE INTO THE CELL! HIGH TO LOW
Does diffusion use
energy?
NO! The cell does not use
energy during diffusion.
Diffusion is also known as
PASSIVE TRANSPORT.
Passive transport video – 4 minutes – click once to start
What is OSMOSIS?
OSMOSIS is a special name
for the diffusion of WATER
across a cell membrane.
Why is water important?
Water is needed for dissolving
and carrying materials, giving
support to plant cells and
making up 75% of your body!
PLANT CELL WITH WATER
CELL WALL
WATER VACUOLE
WATER PUSHES
ON CELL WALL
MAKING IT RIGID
CELL WALL
WATER VACUOLE
PLANT CELL WITHOUT WATER
CELL WALL
CAVES IN
WITHOUT
WATER
PRESSURE
What is
ACTIVE TRANSPORT?
Active Transport is the process of
molecules moving from an area of
low concentration (LESS DENSE)
to an area of high concentration
(DENSE).
Does active transport use
energy?
YES! The cell uses energy
during active transport.
Why do cells use
active transport?
Cells can store nutrients in high #s.
(H2O, glucose, oxygen)
Cells can keep wastes out.
Cells get large molecules in/out
CELL MEMBRANE
MOLECULE
HIGH
LOW
MOLECULES MOVE INTO THE CELL! LOW TO HIGH
CELL MEMBRANE
MOLECULE
LOW
HIGH
MOLECULES MOVE OUT OF THE CELL! LOW TO HIGH
What does SELECTIVELY
PERMEABLE mean?
Selectively permeable means
that the cell can control what
goes in or out of the cell
membrane.
Also called a
SEMIPERMEABLE Membrane
Active transport video – 5 minutes – click once to start