1. Photosynthesis

2. Why is Photosynthesis important?
Makes organic molecules out of inorganic materials.
It begins all food chains & webs.
All life is supported by this process.
It also makes oxygen gas!
Organic molecules = glucose
Inorganic = CO2 + water

3. Photosynthesis- THE start to food webs!

4. Photo-synthesis
= “making things with light."
Plants use sunlight to turn water and carbon dioxide into glucose.
Plants use glucose as food
Autotrophs make glucose and heterotrophs are consumers of it.

5. Photosynthesis 6CO2 + 6H2O + energy  C6H12O6 + 6O2
Carbon dioxide + water glucose + oxygen
sunlight
absorbed by chlorophyll
6CO2 + 6H2O + energy  C6H12O6 + 6O2
As can be seen from the equation for photosynthesis, the wood, bark, and root came from water and carbon dioxide

6. Quick Read Turn to page 103 in your text Read through pages 103-105
Take some notes on what you read
Pay attention to the graphics
C6H12O6
granum (stack of thylakoids)
thylakoid
sunlight
1 six-carbon sugar
6H2O
6CO2
6O2
chloroplast 1 2 4 3
energy
stroma (fluid outside the thylakoids)

7. In plants, chlorophyll is found in organelles called chloroplasts.
Chlorophyll is a molecule that absorbs light energy.
leaf cell
In plants, chlorophyll is found in organelles called chloroplasts.
leaf

8. Photosynthesis in plants occurs in chloroplasts.
Photosynthesis takes place in two parts of chloroplasts.
grana (thylakoids)
stroma
chloroplast
stroma
grana (thylakoids)

9. The light-dependent reactions capture energy from sunlight.
take place in thylakoids
water and sunlight are needed
chlorophyll absorbs energy
energy is transferred along thylakoid membrane then to light-independent reactions
oxygen is released

10. The light-independent reactions make sugars.
take place in stroma
needs carbon dioxide from atmosphere
use energy to build a sugar in a cycle of chemical reactions

11. The equation for the overall process is:
6CO2 + 6H2O  C6H12O6 + 6O2
C6H12O6
granum (stack of thylakoids)
thylakoid
sunlight
1 six-carbon sugar
6H2O
6CO2
6O2
chloroplast 1 2 4 3
energy
stroma (fluid outside the thylakoids)

12. Chloroplast Structure
Draw and label the thylakoid, granum, stroma, & outer membrane
Chloroplasts have two membranes. In the inner membrane there are flat sacs called thylakoids. Thylakoids that are bunched together are called granum. The stroma is the space between the grana.

13. Step 1 Light Dependent Reaction
What two things enter step 1?
Where does step 1 occur?
What two things leave step 1?
Why is it called the light dependent reaction?

14. Step 2 Light independent reaction
What two things enter step 2?
Where does step 2 occur?
What two things leave step 2?

15. Elodea using photosynthesis What gas do you think is in the bubbles that the plant made?

16. Plants in Action
Glucose

17. Two Steps of Photosynthesis
Light Dependent Reactions (thylakoid)
Sunlight is absorbed and converted to chemical energy
Water is taken in and broken down into oxygen
Chemical energy is temporarily stored in plants as ATP
Light Independent Reactions (stroma)
CO2, ATP, make organic compounds
6CO2 + 6H2O C6H12O6 + 6O2

18. Studying Photosynthesis
Know what goes into each step and comes out of each step
Know the different structures of the chloroplast
Be able to label the diagram on the following slide
Watch the following videos:
Bozeman Science
Animation with Explanation
Crash Course