1. Photosynthesis

3. What is Photosynthesis?
Photosynthesis is when autotrophs make their own food/glucose.
Photosynthesis takes light energy,water, and breaks apart carbon dioxide and converts it into stored energy in glucose.

4. Where does Photosynthesis happen? (read)
It takes place inside the CHLOROPLAST, with dozens of them found in the cells of each leaf

5. What are the Parts of the Chloroplast?
#1. Thylakoids—saclike photosynthetic membranes -Arranged in stacks called granum
solution surrounding them= #2. Stroma.
Single
thylakoid
Stroma
Granum
Chloroplast

6. Why are Most Plants Green?
Light travels in waves.
In order to capture the energy in light, plants use a main pigment called chlorophyll.
This pigment reflects green light making plants look green.

7. Visible Light Spectrum
The suns energy travels in waves
The distance between waves = wavelength
Different wavelengths of light are visible as different colors

8. ROY G BIV Longest wavelength = Least amount of energy
Shortest wavelength = larger amount of energy

9. Why Do Leaves Change Color in the Fall
The chlorophyll breaks down, leaving only carotenoid pigments that reflect orange, red, and yellow..

10. Why do plants look Green?
8-1
Why do plants look Green?
There is much more chlorophyll than the other pigments (the other colors are masked).
In the Fall, chlorophyll is broken down and the accessory pigment colors are shown.
Why do trees lose leaves in the winter?
It’s difficult to absorb H2O from frozen ground so leaves drop off to save water.

11. As the chlorophyll in leaves decays in the Fall, the green color fades and is replaced by the oranges and reds of carotenoids

12. Reactants of photosynthesis?
LIGHT
Carbon Dioxide
GLUCOSE
Water
Carbon Dioxide + Water 12

13. Products of photosynthesis?
LIGHT
Oxygen
GLUCOSE
Glucose
Oxygen & Glucose 13

14. The GOAL of photosynthesis?
-Oxygen is a waste product-
GLUCOSE is the goal!
LIGHT
GLUCOSE 14

15. The Equation! Word Form: Carbon Dioxide +Water Glucose + Oxygen
Balanced Chemical Equation:
6CO2 + 6H2O C6H12O6 + 6O2
Light Energy
Light Energy

16. What are the Reactions?
Photosynthesis is 2 reactions happening simultaneously in the chloroplast! -1st- Light Dependent Reaction. 2nd –Calvin Cycle a.k.a. Light Independent reaction The 2nd reaction can not happen without the first.

17. Light dependent reaction(Step 1)
a.)Occurs in the thylakoids of chloroplast
b.)Starts w/water (H2O) and sunlight absorbed by chlorophyll
c.)Makes Oxygen (O2) ,ATP energy

18. Light- dependent reactions
H2O
CO2
Light
NADP+
ADP + P
Light- dependent reactions
Calvin Cycle
Calvin cycle
The process of photosynthesis includes the light-dependent reactions as well as the Calvin cycle.
Chloroplast O2
Glucose 18

19. The Calvin Cycle (light-independent) (2nd Step)
Occcurs in the stroma of the chloroplast
Uses ATP from the light dependent reaction and CO2 to produce high energy glucose

20. Light- dependent reactions
Calvin Cycle -aka-Light Independent Reaction
H2O
CO2
STROMA
Light
NADP+
ADP + P
Light- dependent reactions
Calvin Cycle
Calvin cycle
The process of photosynthesis includes the light-dependent reactions as well as the Calvin cycle.
Chloroplast O2
Glucose 20

21. Light reaction reactants =sunlight, water, NADP+, ADP
Identify the reactants/products for BOTH the light reactions and the calvin cycle.
Light reaction reactants =sunlight, water, NADP+, ADP
Light reaction products= ATP and NADPH
Calvin Cycle Reactants= ATP, NADPH, CO2, (and RuBP)
Calvin Cycle Products= NADP+, ADP, Glucose (orgaqnic compunds)

22. What might happen to photosynthesis if ATP were not produced in the light reactions
W/O ATP calvin cycle would stop, and so would photosynthesis
Relate the rate of photosynthesis to carbon dioxide levels
Increase CO2=increased photosynthesis rate
Which of the following is a reactant in the calvin cycle
A B. CO2 C. H2O D. C6H12O6
Oxygen is produced at what point in photosynthesis?
A. when CO2 is fixed B.when water is split C. When ATP is converted to ADP D. when 3-GPA is converted to G3P

23. Factors Affecting Photosynthesis
1) Light Intensity
in light = ____ in the rate of photosynthesis
2)Temperature –
best between 0 C and 35 C
3) Carbon Dioxide Levels
in CO2 = ____ in the rate of photosynthesis

27. What plants do with the glucose
Use it for energy in cellular respiration to make ATP
2)Converted to cellulose to make cell walls

29. Light Dependent Reaction=Thylakoid membranes/Calin=Stroma
Review ?’s(p.118, p.126,127)
Where in the chloroplast do the light reaction and calvin cycle take place?
Light Dependent Reaction=Thylakoid membranes/Calin=Stroma