Bell Work: 1/6/12

1.
2.
3.
4.
Directions: Write the answer true or false for each statement
below.
Particles move into and out of cells by passing through the
nucleus.
Particles can move through the membrane in two ways: by active
transport and passive transport.
Passive transport needs energy from food to move the particles.
A semi-permeable membrane allows only some particles to pass.
Directions: Choose a word from the word bank below that
describes each statement.

Osmosis
5.
6.
diffusion
The movement of particles from an area of high concentration
(crowded) to an area of low concentration (less crowded) until both
sides are equal.
The movement of water through a semi-permeable membrane.
Important Review:
Diffusion: Particles move from a high concentration to a low
concentration
Water, food, and oxygen are examples of things that MUST
move into the cell so that it survives. Wastes MUST move
out of the cell so that it survives. Molecules will move in
and out of the cell so that an equilibrium is reached. There
must always be an equal balance on both sides of the cell
membrane.
The cell membrane is Selectively Permeable- some things
are allowed to go through it and others are not.
Osmosis is a type of Diffusion. Water molecules are
diffused in and out of a cell. It DOES occur in plant and
animal cells.
Osmosis and Diffusion require passive transport of
materials. Energy is NOT needed- just happens!
Active transport is when ENERGY is needed!
Objectives

Explain how materials move through simple
diffusion. (SPI 0707.1.5)

Diffusion/Osmosis Lab

Compare the chemical compounds that make
up the reactants and products of
photosynthesis and cellular respiration. (SPI
0707.3.1)

Interpret a diagram to explain how oxygen and
carbon dioxide are exchanged between living
things and the environment. (SPI 0707.3.2)
It’s Time For…
Diffusion Lab Questions
1. The plastic bag is semipermeable to which
substance?
2. Why did the iodine enter the bag?
3. Why didn’t the starch enter the beaker?
4. How is the plastic bag like the cell
membrane?
5. What is the definition of the word
“diffusion”?
Meatloaf
6 ounces garlic-flavored croutons
1/2 teaspoon ground black pepper
1/2 teaspoon cayenne pepper
1 teaspoon chili powder
1 teaspoon dried thyme
1/2 onion, roughly chopped
1 carrot, peeled and broken
3 whole cloves garlic
1/2 red bell pepper
18 ounces ground chuck
18 ounces ground sirloin
1 1/2 teaspoon kosher salt
1 egg
What is photosynthesis?
____________
Photosynthesis is the
process by which plants
make their own food.
The word photosynthesis
means – combine with
_______
or _______
by
made
light
light.
Where does photosynthesis occur?
Photosynthesis occurs in the ________
leaves of
a plant. More specifically- in the
___________.
chloroplasts
Chloroplasts
Plant Cell

Chloroplast
are
organelles
in a plant
cell.
Inside of the chloroplast
 _____________
Chlorophyll is
found in the
chloroplasts.
 Chlorophyll is the
___________
pigment that
makes the plant
_________.
green
 Chlorophyll
__________
absorbs light
energy.
Photosynthesis needs and products:
Plants use the ______
light energy captured
by chlorophyll to change carbon
______ dioxide
______
and _______
water to food.
The food is in the form of a sugar called
__________
(C6H12O6).
glucose
Photosynthesis also produces ________.
oxygen
How does photosynthesis help
us?
During the process of photosynthesis,
oxygen is produced. We use this
oxygen to breathe. We also receive
energy from the plant when we eat
plants.
Reactants vs. Products
 Reactants are what you need to make
something- The reactants for photosynthesis
are Sunlight, Carbon Dioxide and Water.
 Products are what you make- The products
for photosynthesis are Glucose (sugar) and
Oxygen.
EQUATION FOR
PHOTOSYNTHESIS
Where does the food (glucose) go next?
Discuss with an elbow partner.

The glucose is transported from the
chloroplast to the “Power House,” or
mitochondria.

The Mitochondrion are where cellular
respiration take place.
Photosynthesis and Cellular Respiration
 Cellular respiration is a chemical reaction
that occurs in cells.
 During cellular respiration, cells use oxygen
to produce energy from food.
 Food (glucose) is broken down into CO² and
H O, and energy is released.
²
 The released energy is used to maintain body
temperature in animals. It is also used to
form ATP, which supplies energy that fuels
cell activities.
The Connection Between Photosynthesis and Respiration
Reactants vs. Products
 Reactants are what you need to make
something- The reactants for cellular
respiration are Glucose (sugar) and
Oxygen.
 Products are what you make- The products
for cellular respiration are Carbon Dioxide,
Water and ATP.
EQUATION FOR
RESPIRATION
Alternative to Cellular Respiration
 Fermentation produces ATP without using
oxygen. It can occur in muscles when they
are unable to get oxygen for respiration.
 Fermentation also produces lactic acid. This
acid can cause muscle fatigue.
Scientist Notebook Drawing
Draw, color, and label a diagram to explain
how oxygen and carbon dioxide are
exchanged between living things and the
environment.
Oxygen
Carbon
Dioxide