Download Plant Cells

Cells
Functions and Processes
Marybeth Gardner
FBISD Science specialist
2007
Are these cells?

Virus
Bacterial Prokaryote
Eukaryote
Is it a plant or animal cell?
What do you look for in a plant and animal cell?
Blood
cells
leaf cells
cheek
cells
Cells
Animal
Plant
cell
membrane
chloroplast
mitochondria
nucleus
vacuole
Cell wall
How are animal and plant cells alike?
Cell Organelles To Know:
Nucleus – the control center
Contains most
of the cell’s
DNA genetic
information for
coding proteins.
It tells the cell
how to do its
jobs of dividing,
making
proteins, ETC.
Mitochondria - Energy



Provides energy
for cell use.
Converts energy
in food to ATP
Powerhouse
of the cell
Chloroplast
Converts solar
energy
into food or
chemical
energy for
plants.
Plants are the source
of food and energy
for organisms that
cannot make their
own food such as
animals, fungi.
Vacuole
Stores water,
minerals
and nutrients.
vacuole
Cell Membrane – “Gate Keeper”
•
Protects and supports
the cell
•
Cells require a variety
of molecules to survive.
The cell membrane
regulates the materials
that enter and leave the cell.
Homeostasis, Diffusion, and Osmosis

Homeostasis is the maintenance of a stable internal
state within an organism. Examples of homeostasis
in our bodies are:



Regulation of water content
Regulation of body temperature
Regulation of blood glucose levels
Name 3 examples of homeostasis in cells.
What do individual cells need to control or
regulate?
Transportation of molecules in plant cells:
Diffusion
6. Explain the process in the beaker on the
overhead.
Transportation of molecules in plant cells:
Diffusion
The spontaneous movement of particles from an
area of higher concentration to an area of
lower concentration.
Transportation of molecules in plant cells:
Osmosis
View the osmosis animation.
What does the red line represent?
Notice the movement of water before salt is added.
Explain the movement of water molecules when
salt is added. Notice the level of the water.
http://www.stolaf.edu/people/giannini/flashanimat/transport/osmosis.swf
Transportation of molecules in plant cells:
Osmosis
What happens in osmosis? Explain the direction of
water movement.
http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htm
Scroll down to show the 3 animations.
Transportation of molecules in plant cells:
Osmosis
View the following clips on osmosis in plant cells.
http://video.google.com/videoplay?docid=7439512663261866598&q=osmosis&hl=en
http://video.google.com/videoplay?docid=-1349343891006732106&q=osmosis&hl=e
A 10% salt solution was added to the plant
cells.
What happened to the
water in the cell?
Evaluation:
Osmosis
Think about what happens to the skin on your
hands and toes after soaking in water or going
swimming.
(Osmosis)
Next slide:

Evaluation: answer a or b
Osmosis
1. Place your hand in salt water. What
happens to the cells of the skin?
A. Wrinkled hands
B. Smooth hands
OR
Evaluation: answer a, b, or c
Osmosis
2. Cells placed in pure distilled water without any
minerals will:
A. Remain normal
B.
C.
Evaluation: answer a or b
Osmosis
Predict what will happen to the cells of the fish.
3. Place a salt water fish from the Gulf of Mexico into an aquarium
of fresh water.
A. Fish cells swell and burst
B. Fish cells lose water and dehydrate
OR
4. Describe the transportation of molecules in
these slides of onion cells.
END OF POWER POINT
Transportation of molecules in plant cells:
Osmosis
You and your partner have two beakers. Add
28 mL tap water to both beakers. Add a
teaspoon of salt to one beaker and label it
with an “s”.
 Use the eye-dropper
to remove enough water from
the beaker with salt until the
liquid in both beakers is the same.

Transportation of molecules in plant cells:
Osmosis
Add a carrot or potato to both beakers.
11. Describe the texture and
color of the carrot or potato.
12. Which beaker has the
greater concentration of water
molecules?
13. What is the solute in one of
the beakers?
Transportation of molecules in plant cells:
Osmosis
14. Hypothesize: what do you
think will happen to the carrot
or potato you put in salt
water? What do you think will
happen to the one in regular
tap water?