What is Cellular Respiration?
Once the energy that was in sunlight is changed
into chemical energy by photosynthesis, an
organism has to transform the chemical
energy into a a form that can be used by the
organism.
This process is cellular respiration.
Describe Cellular Respiration
The breakdown of glucose molecules to release
energy for all the life processes.
Takes place in all living organisms
Where Does it Occur?
Cellular Respiration
• Occurs in the mitochondria
• Here the energy released
from glucose is stored in ATP
molecules.
• Most organisms have these.
Glucose molecule
Photosynthesis Reaction
This is why plants absorb
in carbon dioxide.
This is why we can eat
plants to get energy.
6CO2 + 6H2O (+ energy)  C6H12O6 + 6O2
This is why plants
need sunlight.
This is why plants
need water.
This is why plants
produce oxygen.
Equation for Cellular Respiration
This is why we eat.
Plants don’t eat;
they make this with
sunlight.
Glucose
Oxygen
This is why we
breathe oxygen.
The energy released from
the glucose is stored in
molecules of ATP for later
use.
Carbon Dioxide
This is why we
breathe out
carbon dioxide.
Water
Energy
The water
we can use.
Gas Balance
all the time
glucose + oxygen  carbon dioxide (CO2) + water
daylight only
carbon dioxide + water

glucose + oxygen
During the day:
Oxygen released by photosynthesis is greater than
the amount of oxygen used up in respiration.
CO2 used in photosynthesis is greater than the
amount of CO2 produced by respiration.
Plants’ uses of plant glucose
Raw material for
growth, repair and
replacement of
damaged parts
To make fats & oils
(energy stored in
seeds)
Energy stored as
sucrose (in fruit)
Energy stored as
starch (in leaves,
seeds, roots and
tubers)
Used immediately to
provide energy
source for respiration
Glucose
Energy used to
turn sugars,
nitrates & other
nutrients into
amino acids
which build up
proteins
To make cellulose,
the main structural
material in cell walls
Mans’ uses of plant glucose
Review Question # 1
1. In respiration the released energy is stored in
molecules of
A. glucose
B. DNA
C. carbon dioxide
D. ATP
Review Question # 1
1. In respiration the released energy is stored in
molecules of
A. glucose
B. DNA
C. carbon dioxide
D. ATP
Review Question # 2
2. Which statement about photosynthesis is most
correct?
A. The reaction is exothermic.
B. Energy is required to construct the glucose
molecules.
C. Energy is released in the reaction.
D. ATP molecules are used to start the
reaction.
Review Question # 2
2. Which statement about photosynthesis is most
correct?
A. The reaction is exothermic.
B. Energy is required to construct the glucose
molecules.
C. Energy is released in the reaction.
D. ATP molecules are used to start the
reaction.
Review Question # 3
3. Which statement about respiration is not
correct?
A. The reaction is exothermic.
B. Energy is required to construct the glucose
molecules.
C. Energy is released in the reaction.
D. Energy released is used to create ATP
molecules.
Review Question # 3
3. Which statement about respiration is not
correct?
A. The reaction is exothermic.
B. Energy is required to construct the glucose
molecules.
C. Energy is released in the reaction.
D. Energy released is used to create ATP
molecules.
Review Question # 4
4. Which chemical is not a product of respiration?
A. carbon dioxide
B. ATP
C. oxygen
D. water
Review Question # 4
4. Which chemical is not a product of respiration?
A. carbon dioxide
B. ATP
C. oxygen
D. water
Review Question # 5
5. Chlorophyll
A. makes glucose
B. traps sunlight energy
C. produces oxygen
D. produces carbon dioxide
Review Question # 5
5. Chlorophyll
A. makes glucose
B. traps sunlight energy
C. produces oxygen
D. produces carbon dioxide
Review Question # 6
6. Where does respiration happen?
A. in the mitochondria
B. in ATP
C. in the chloroplast
D. in glucose molecules
Review Question # 6
6. Where does respiration happen?
A. in the mitochondria
B. in ATP
C. in the chloroplast
D. in glucose molecules
Review Question # 7
7. We breathe oxygen because
A. it is needed to make glucose molecules.
B. it is needed to make ATP molecules.
C. it is needed to break apart ATP molecules.
D. it is needed to break apart glucose
molecules.
Review Question # 7
7. We breathe oxygen because
A. it is needed to make glucose molecules.
B. it is needed to make ATP molecules.
C. it is needed to break apart ATP molecules.
D. it is needed to break apart glucose
molecules.
Review Question # 8
8. Which is the correct formula for
photosynthesis?
A) C6H12O6
+ 6O2 + energy  6CO2 + 6H2O B) 6CO2
+ 6H2O  C6H12O6 + 6O2 + energy
C) 6CO2
+ 6H2O + energy  C6H12O6 + 6O2
D) C6H12O6
+ 6O2  6CO2 + 6H2O + energy
Review Question # 8
8. Which is the correct formula for
photosynthesis?
A) C6H12O6
+ 6O2 + energy  6CO2 + 6H2O B) 6CO2
+ 6H2O  C6H12O6 + 6O2 + energy
C) 6CO2
+ 6H2O + energy  C6H12O6 + 6O2
D) C6H12O6
+ 6O2  6CO2 + 6H2O + energy
Review Question # 9
9. Which is the correct formula for cellular
respiration?
A) C6H12O6
+ 6O2 + energy  6CO2 + 6H2O B) 6CO2
+ 6H2O  C6H12O6 + 6O2 + energy
C) 6CO2
+ 6H2O + energy  C6H12O6 + 6O2
D) C6H12O6
+ 6O2  6CO2 + 6H2O + energy
Review Question # 9
9. Which is the correct formula for cellular
respiration?
A) C6H12O6
+ 6O2 + energy  6CO2 + 6H2O B) 6CO2
+ 6H2O  C6H12O6 + 6O2 + energy
C) 6CO2
+ 6H2O + energy  C6H12O6 + 6O2
D) C6H12O6
+ 6O2  6CO2 + 6H2O + energy
Review Question # 10
10. Which statement best shows the relationship
between photosynthesis and cellular
respiration?
A) They both need the same reacting chemicals.
B) They both produce the same products.
C) They are opposite processes, each needing the other’s
products.
D) They are opposite processes, each needing oxygen to occur.
Review Question # 10
10. Which statement best shows the relationship
between photosynthesis and cellular
respiration?
A) They both involve oxygen as a part of the chemical reaction.
B) They both are processes involving energy.
C) They are opposite processes, each needing the other’s
products.
D) They are opposite processes, each needing oxygen to occur.