ENVIRO 2 GO
6211
Photosynthesis
&
Cell Respiration
Objectives
At the end of this ENVIRO 2 GO you will be able to:
 Explain and describe the similarities and differences
between chloroplasts and mitochondrion.
 Explain the function of the cellular mitochondrion and
chloroplast.
 Explain and describe cellular respiration in detail.
 Explain and describe photosynthesis in detail.
 Write the general equation for respiration.
 Write the general equation for photosynthesis.
 Explain how photosynthesis and respiration can be a
cycle.
Key Vocabulary
 Mitochondrion
 Chloroplast
 Respiration
 Photosynthesis
 ATP
 Oxygen
 Carbon dioxide
 Water
Photosynthesis
 Photosynthesis is the process where plants
make their own food.
 During photosynthesis plants take energy from
the sun, carbon dioxide from the air and water
to make glucose (sugar) and oxygen.
 The glucose that is made is what the plants use
for food.
Equation for Photosynthesis
 The equation for photosynthesis is:
presence of sunlight
CO2 + H2O
carbon
Dioxide
water
C6H12O6 + O2
glucose
oxygen
 Carbon dioxide, water & sunlight are called reactants because
they are all necessary for photosynthesis to occur.
 Glucose ,a sugar (carbohydrate) and oxygen are both products
because they are produced from photosynthesis.
Remember This!!!
 Carbon dioxide (CO2), water (H2O) & sunlight
are reactants for photosynthesis (they are
required).
 Glucose (C6H12O2) & oxygen (O2)
are products for photosynthesis (they are made).
The Importance of Sunlight
 Because sunlight is required for photosynthesis,
sunlight is the ultimate source of energy.
 Without plants animals would not have food to
consume for energy.
 Therefore, sunlight is vital for life on earth!
Where Does Photosynthesis Occur?
 Most plants and some bacteria go through photosynthesis.
 Photosynthesis takes place in the chloroplast that is found
within a plant and some bacteria cells.
chloroplast
plant cell
Photosynthesis Review
Question
What is the purpose?
Who does it?
Answer
To make glucose
Where does it occur?
What are the reactants?
In the chloroplast
Carbon dioxide (CO2), water
(H2O) & sunlight
Glucose (C6H12O2) & oxygen
(O2)
What are the products?
What is the chemical
conversion?
Producers (plants) & some
bacteria
Solar energy from the sun 
chemical energy in glucose
Remember This!!!
 Photosynthesis captures the energy of light and
converts it into glucose.
 Glucose is a source of energy that is useable by the
cell.
 Photosynthesis always takes place in the
chloroplasts.
Your Turn!
 What is the purpose of photosynthesis?
 What is the function of chloroplasts?
 Explain why the sun is the source for all energy on
Earth.
Cell Respiration
 Cell respiration is the process where plants and
animals take glucose from animals and use it to
make energy.
 During cell respiration plants and animals eat
plants or other animals to get glucose. They use
the glucose and oxygen to make ATP (energy),
water and oxygen.
 The ATP that is produced provides plants and
animals with the energy needed to survive.
Equation for Cell Respiration
 The equation for cell respiration is:
C6H12O6 + O2
glucose
oxygen
CO2 + H2O + ATP
carbon
water
energy
dioxide
 Glucose and oxygen are called reactants because they both are
necessary for cell respiration to occur.
 Carbon dioxide, water and ATP are all products because they are
produced from cell respiration.
Remember This!!!
 Glucose (C6H12O2) & oxygen (O2) are reactants for
cell respiration (they are required).
 Carbon dioxide (CO2), water (H2O) & ATP
are products for cell respiration (they are made).
Where Does Cell Respiration Occur?
 Plants and animals go through cell respiration.
 Cell respiration takes place in the mitochondria found
within a plant and animal cell.
plant cell
animal cell
mitochondria
Cell Respiration Review
Question
What is the purpose?
Who does it?
Answer
To make ATP (energy)
Producers (plants) &
Consumers (animals)
Where does it occur?
What are the reactants?
In the mitochondria
What are the products?
Carbon dioxide (CO2), water
(H2O) & ATP (energy)
What is the chemical
conversion?
Chemical energy in glucose
 chemical energy in ATP
Glucose (C6H12O2) & oxygen
(O2)
Remember This!!!
 Respiration releases the stored energy in
glucose as ATP. ATP can then be used in
the cell.
 Respiration always takes place in the
mitochondria.
 All cells have mitochondria.
Your Turn
 What is the purpose of respiration?
 What is the function of mitochondria?
 What is the equation for cell respiration?
Photosynthesis & Cell Respiration
as a Cycle
 Photosynthesis and respiration are a cycle.
 Photosynthesis and respiration need each other in
order to have the necessary materials to start their
reaction.
Photosynthesis & Cell Respiration
as a Cycle
 The products of photosynthesis, glucose and
oxygen, are required for cell respiration. That
means, plants make the glucose and oxygen
necessary for animals and plants.
 Animals and plants then take the glucose and
oxygen and go through cell respiration. Here the
carbon dioxide and water that is necessary for
photosynthesis is produced.
Photosynthesis & Cell Respiration
as a Cycle
Photosynthesis
CO2 + H2O + Energy
(the sun)
C6H12O6 + O2
C6H12O6 + O2 CO2 + H2O + Energy
Cell Respiration
Your Turn!
 Explain how photosynthesis and cell respiration
are a cycle.
Watch how photosynthesis & cell respiration are a
cycle!
Summary
 In photosynthesis, the energy in light is used to
combine carbon dioxide and water to make glucose in
the chloroplasts of all green plants. In this process
oxygen is also made and released to the atmosphere.
 In cell respiration, oxygen is combined with glucose
to make ATP. ATP is an energy source that is readily
usable by the cells. ATP is made in the mitochondria.
Carbon dioxide and water are also made and are
released into the environment. Cellular respiration
occurs in both plant and animal cells.
Test Yourself:
Short Answer
1. Write the equation for photosynthesis.
2. Write the equation for cell respiration.
3. Explain the function of the mitochondria.
4. Explain the function of the chloroplasts.
Test Yourself:
Fill in the Blank
Mitochondria chloroplasts ATP
respiration photosynthesis
1. The ________________ provide a location for photosynthesis to take place.
2. _______________ and ________________ are 2 chemical reactions that occur that
involve energy capture and release.
3. In the process of ___________________________, _____________ is the usable form
of energy that is created.
4. The green organelle that converts light energy into chemical energy is
called ______________.
5. The ____________________ are found only in the cells of green plants, but the
_______________________ are found in all cells.
6. _______________________ requires carbon dioxide and water to make glucose.
7. Cellular respiration occurs in the __________________________ and creates the
usable form of energy called _____________.
Test Yourself:
True/False
_____ 1. Chloroplasts are found in all cells.
_____ 2. Respiration creates ATP.
_____ 3. Respiration occurs in the chloroplasts.
_____ 4. Respiration uses water to make oxygen.
_____ 5. Photosynthesis occurs in the chloroplasts and
mitochondria.
_____ 6. Photosynthesis only occurs in animals.
_____ 7. Photosynthesis combines oxygen and carbon
dioxide to make ATP.
_____ 8. ATP is made during respiration.
_____ 9. Photosynthesis and respiration form a cycle.