SCIENCE STARTER
Make a list of at least 3 reasons why
cells may need energy. Remember that
there are many different types of cells!
PHOTOSYNTHESIS
SPI 0707.3.1
(Photosynthesis and
Respiration)
A few terms to remember
before we begin
O2= chemical formula for Oxygen, what we breathe in and plants
breathe out
CO2=chemical formula for Carbon Dioxide, What we breathe out when
we exhale and plants breathe in
C6H12O6- chemical formula for Glucose, also known as sugar… not the
kind you eat. The kind that gives plants energy!
ATP- Adenosine Triphosphate also known as Energy!
◦Brainpop
How Energy is Obtained By
Living Things.
◦ Nearly all of the energy that fuels life comes from the sun. Plants
capture energy from the sun and change it into food.
◦ The process by which a cell captures energy in sunlight and uses
it to make food is called photosynthesis.
◦ The food that plants make supplies them with energy. This food
also becomes a source of energy for the organisms that eat the
plants
Energy from the Sun
Organisms that cannot
make its own food are
called a heterotrophs.
Heterotrophs obtain food
by eating other
organisms.
Autotrophs:
Organisms that
manufacture their
own food by
Photosynthesis.
(plants)
Photosynthesis
◦The process by which plants,
algae, and some bacteria use
sunlight, carbon dioxide, and
water to make sugar.
Photosynthesis
◦Plant cells have an organelle called
chloroplast that contain a pigment
called chlorophyll. Chlorophyll gives
plants their green colors and also
help to absorb sunlight
◦Photosynthesis occurs in
chloroplasts!!
Chlorophyll is a fluid found in the
chloroplasts that absorb light from the
sun
◦Plants use solar energy
captured by chlorophyll to
change carbon dioxide and
water into sugar.
◦This sugar is then used as
energy by plant’s cells.
How Photosynthesis Works
◦ Photosynthesis is a complex process.
◦ Plants use the energy of the sun to convert
carbon dioxide (CO2) and water (H2O) into
oxygen (O2) and sugar (C6H12O6)
◦ Photosynthesis is a two stage process
◦ Like baking a cake:
◦ Stage 1: Combine the ingredients to make
the batter
◦ Stage 2: Bake the Batter
Photosynthesis Equation
Here’s a trick to help you remember:
Can William Eat Giant Oreos?
Photosynthesis
Water
Carbon
Dioxide
Sunlight
Glucose(sugar)
and Oxygen
#1
Chloroplast from the
plant cells capture
energy
from sunlight.
Chloroplast from the
plant cells capture
energy
from sunlight.
#2
Captured light
energy is used to
produce sugars
and oxygen from
water and carbon
dioxide
Chloroplast from the
plant cells capture
energy
from sunlight.
Captured light
energy is used to
produce sugars and
oxygen from water
and carbon dioxide
#3
Carbon dioxide enters the
leaf through openings
called stomata
Chloroplast from the
plant cells capture
energy
from sunlight.
Captured light
energy is used to
produce sugars and
oxygen from water
and carbon dioxide
Carbon dioxide
enters the leaf
through openings
called stomata
#4
Water enters the
plant through
roots and moves
upward to the
leaf
Chloroplast from the
plant cells capture
energy
from sunlight.
Captured light
energy is used to
produce sugars and
oxygen from water
and carbon dioxide
Carbon dioxide
enters the leaf
through openings
called stomata
Water enters the
plant through roots
and moves upward
to the leaf
#5
Sugars produced
are used by the
plant cells for
energy
Chloroplast from the
plant cells capture
energy
from sunlight.
Captured light
energy is used to
produce sugars and
oxygen from water
and carbon dioxide
Sugars produced are
used by the plant cells
for energy
Carbon dioxide
enters the leaf
through openings
called stomata
Water enters the
plant through roots
and moves upward
to the leaf
#6
Oxygen exits
through
stomatoa on the
underside of the
leaf
Chloroplast from the
plant cells capture
energy
from sunlight.
Captured light
energy is used to
produce sugars and
oxygen from water
and carbon dioxide
Sugars produced are
used by the plant cells
for energy
Carbon dioxide
enters the leaf
through openings
called stomata
Water enters the
plant through roots
and moves upward
to the leaf
#7
Oxygen exits
through stomatoa on
the underside of the
leaf
Chloroplast from the
plant cells capture
energy
from sunlight.
Captured light
energy is used to
produce sugars and
oxygen from water
and carbon dioxide
Sugars produced are
used by the plant cells
for energy
Carbon dioxide
enters the leaf
through openings
called stomata
Water enters the
plant through roots
and moves upward
to the leaf
Light energy
6CO2 + 6H2O
C6H12O6 + 6O2
Oxygen exits
through stomatoa on
the underside of the
leaf
The Photosynthesis
Chemical Equation
Light Energy
6CO2 + 6H2O
C6H12O6 + 6O2
6CO2 + 6H2O
Carbon Dioxide
C6H12O6 + 6O2
C6H12O6 + 6O2
6CO2 + 6H2O
Water
6CO2 + 6H2O
C6H12O6 + 6O2
Sugar (glucose)
6CO2 + 6H2O
C6H12O6 + 6O2
Oxygen
SCIENCE STARTER
Write out the chemical formula
for photosynthesis then
describe why photosynthesis is
important.
CELLULAR
RESPIRATION
SPI 0707.3.2
(Exchange of carbon dioxide
and oxygen)
Lets review what we learned
yesterday!
Pay close attention, you will be
having a quiz at the end of class
The Photosynthesis
Chemical Equation
Light Energy
6CO2 + 6H2O
C6H12O6 + 6O2
6CO2 + 6H2O
6 molecules of
Carbon Dioxide
C6H12O6 + 6O2
6CO2 + 6H2O
C6H12O6 + 6O2
6 molecules of Water
6CO2 + 6H2O
C6H12O6 + 6O2
Sugar (glucose)
6CO2 + 6H2O
C6H12O6 + 6O2
Oxygen
What is Cellular Respiration?
◦The process by which cells use
oxygen to break down sugar
to form energy.
◦Brainpop
◦Cellular respiration happens in
the MITOCHONDRIA!!
Chemical Equation for Cellular
Respiration:
◦Here’s a trick to help you remember:
◦Giant Oreos Come With Apple Sauce
Cellular Respiration
Glucose
Oxygen
Carbon Dioxide+ Water+ ATP(energy)
Reactants and products
◦ Reactants
What’s needed before the
reaction can begin (what do
you need to make a cake?)
◦ Products
End result of reaction (what
comes out of the oven?)
what are the reactants for
photosynthesis?
what are the products for
photosynthesis?
what are the reactants for
respiration?
what are the products of
respiration?
Quiz time!
1. Which of the following
organelles does photosynthesis
take place?
◦
◦
◦
◦
A. Chloroplast
B. Ribosome
C. Vacuole
D. Mitochondria
2
. The equation below illustrates the reaction that
occurs in chloroplast during photosynthesis
What is the product of photosynthesis?
A. carbon Dioxide and glucose
B. Water and glucose
C. Sunlight and glucose
D. Oxygen and glucose
3. Chloroplasts are found only in
organisms that are able to
A. hunt for prey
B. generate their own food
C. grow to a larger size
D. migrate to other ecosystems
4. Which chemical compounds are
the reactants of photosynthesis and
products of cellular respiration?
◦ A. water (H2O) and glucose (C6H12O6)
◦ B. oxygen (O2) and carbon dioxide (CO2)
◦ C. glucose (C6H12O6) and oxygen (O2)
◦ D. carbon dioxide (CO2) and water (H2O)
5. Which of these equations best
shows the reactants and products
of cellular respiration?
◦
A. carbon dioxide + water  sugar + oxygen
◦
B. water + oxygen  sugar + carbon dioxide+ATP
◦
C. sugar + oxygen  carbon dioxide + water+ATP
◦
D. sugar + carbon dioxide  oxygen + water