Photosynthesis & Cell Respiration
ENVIRO 2 GO
6211
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.
The equation for photosynthesis is:
 Carbon dioxide, water & sunlight are called reactants because they are all
necessary for photosynthesis to occur.
 Glucose (a sugar) 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.
Photosynthesis Review
Question
Answer
What is the purpose?
Who does it?
Where does it occur?
What are the reactants?
What are the products?
What is the chemical conversion?
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!
1. What is the purpose of photosynthesis?
2. What is the function of chloroplasts?
3. 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.
The equation for cell respiration is:
 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) & ATPare 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.
Cell Respiration Review
Question
Answer
What is the purpose?
Who does it?
Where does it occur?
What are the reactants?
What are the products?
What is the chemical conversion?
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!
4. What is the purpose of respiration?
5. What is the function of mitochondria?
6. 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.
 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.
Your Turn!
7.
Explain how photosynthesis and 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.