Name __________________________________________ Period _____ Date _______________
PHOTOSYNTHESIS Notes
1) Photosynthesis - When plants (photoautotrophs) make
their own food from sunlight,
building _______________ from ____________
2) Equation for photosynthesis
Carbon Dioxide + Water + SUNLIGHT

Sugar + Oxygen
_____________ + _____________ + ______________  ______________ + _____________
3) Photosynthesis occurs in the _________________
4) Thylakoids – disks inside chloroplast where photosynthesis occurs
Grana – Stacks of thylakoids
Stroma – The fluid surrounding thylakoid
5) Pigments –
Substances that absorb visible light
Found in the membrane of thylakoid
6) Chlorophyll- The green pigment in plant chloroplasts that absorbs the most light for
photosynthesis
7) Chlorophyll absorbs mostly _________ and _______ light. __________ light is reflected.
8) Why do plants appear Green? –
Red and blue _____________ into chlorophyll and Green is ________________
9) Why do Leaves change color in the fall?
Green leaves have pigments of different colors beside chlorophyll.
Usually the other colors are ______________ by the great amount of chlorophyll.
When the leaf dies and loses its chlorophyll, the other pigments (orange, red, yellow)
become visible.
10) 2 basic steps for photosynthesis:
a) Light reactions – (light ___________________)
b) Dark reactions – (light ___________________)
c) Light reactions convert light to
__________________ energy
d) Dark reactions turn Chemical energy into
__________________ (organic molecule)
11) Light reactions - Called light dependent because they MUST have light to occur
Light reactions have 2 parts called photosystems and occur in the ____________________
12)Photosystem II (PSII) Comes _____________
PSII Purpose  Break water to generate _________________
A) Sunlight hits ________________________ which is called the reaction center
B) This releases ____________ which travel through molecules in the electron transport
chain (ETC) ending at PSI
C) Water splits into protons, electrons and oxygen. This provides more electrons to travel
to down ETC to PSI
H20

__________ + ____________ + ______________
13)Oxygen comes from the H2O
2H20

4 H+ + 4 e- + O2
Oxygen (O2) – Released as a gas,
Oxygen is ________ needed for photosynthesis
14)Photosystem I (PSI) comes _____________
PSI Purpose  form energy molecules _______ and __________
A) Electrons reach PSI reaction center in a second molecule of
___________________
B) Sun helps electrons go through a second ETC
Causing NADH+ to turn into ___________________
C) ATP synthase enzyme pushes protons (H+) out of membrane to make __________
15)Summary of Light reactions
H20 + sunlight + NADP+ + ADP 
________ + ____________ + ___________
 The energy molecules NADPH and ATP cannot be stored for long.
 They will be used in Dark reactions to make __________
16)Dark reactions = Calvin Cycle) = Light Independent reactions
The process of using ________and __________ energy to join CO2 into ___________
17)Why is the Calvin Cycle called the Light independent reactions?
 They can happen in __________ OR dark
The Calvin Uses ATP and NADPH from the light reactions to make Sugar
If there is no light, they soon use up the ________ and ________ and stop working!
18)Calvin Cycle builds sugar from CO2
1 turn of the cycle adds _____carbon to sugar
3 turns of the cycle produce a _______ carbon sugar.
6 turns of the cycle forms a ________ carbon glucose sugar
19)What happens to the 3 carbon sugars?
They can form:
_____________, Sucrose, Starches, amino acids (using N) and other organic molecules
20)Dark reaction summary
__________ + NADPH + ATP 
_________ + NADP+ + ADP + P
21)Photosynthesis overview
Carbon Dioxide + Water + SUNLIGHT

Sugar + Oxygen
1st – The light dependent reactions
Change light energy to chemical energy in form of ATP and NADPH
(Water is used up and oxygen is produced)
2nd – The light independent reactions
Use the ATP and NADPH to build sugar from carbon dioxide
Other Examples of The reactions of photosynthesis in a chloroplast