JE #23: Photosynthesis
A – Photosynthesis: Inputs and Outputs of Matter (Nutrients) and Energy
Meet in your poster groups
On your original poster (you may use the back if you wish) make a labeled drawing
depicting the inputs/outputs of matter and energy in photosynthesis.
Make a labeled drawing of your group’s information on photosynthesis in your journal
showing inputs/outputs of matter and energy.
What terms did you use?
B - Photosynthesis in Equation Form
Look at the photosynthesis equation and compare it to your opener
1) Write the photosynthesis process in words
2) Write the photosynthesis process as a (balanced) chemical equation
Compare the Two: Do your words match up with the chemical formulas?
Explain.
C - ATP: Universal Energy Carrier
Source of Energy: One of the principal compounds that living organisms use to store
and release energy for work to be done in the cell.
ATP (Adenosine Triphosphate) contains the following three parts:
A 5 carbon ribose sugar, the nitrogenous base adenine and 3 phosphate groups.
Storing Energy: ADP + P  ATP (endergonic reaction).
Add a phosphate (phosphorylation) by forming a bond.
Releasing Energy: ATP – P  ADP (exergonic)
Subtract a phosphate by breaking a bond (by hydrolysis).
Key Question: How does ATP play a significant role in Photosynthesis?
Chemical Energy and ATP
Read pages 201-203 and answer the following questions in complete sentences.
P. 203: 1-5
D - Where does Photosynthesis Occur?
Chloroplast Diagram
(See Journal Entry #13)
Label the following structures on you diagram:
Grana (sing: granum), Thylakoids, and Stroma
(Notes)
Chloroplasts are made up of Grana (sing: granum) where the Light Dependent Reactions
(LDR’s) take place and stroma, where the Calvin Cycle takes place. Grana are made up of
structures called thylakoids. Thylakoids contain
chlorophyll that absorbs light energy.
See P. 207 (Fig. 8-5) and answer the following questions in complete sentences:
1) Chlorophyll (a and b) absorbs light in what wavelengths?
2) What happens to the light in the green wavelengths?
E – The Light Dependent Reactions of Photosynthesis
Fill in the missing information on your Chloroplast diagram.
Look at Part B (Photosynthesis equation) for the answer.
1) Write the Photosynthesis Equation:
Circle the parts of the equation which are involved in the LDR’s
(see your Chloroplast Diagram)
2) 2H2O  4H + O2
Water molecules are split by the
light energy
(think of Chemistry Unit and Life Occurs in
Water and Water Lab)
3) What happens to the oxygen?
The oxygen is released to the atmosphere
4) What happens to the Hydrogen?
(See your Chloroplast Diagram)
H+ ions are used to energize (NADP+ H+  NADPH) and provides the energy to make ATP
from ADP + P (storing or releasing energy?) This is made possible by the electron transport
chain which transports H+ ions from the stroma to the inner thylakoid membranes.
5) ATP and NADPH from the light dependent reactions are used to make sugars in the Calvin
Cycle. How will ATP and NADPH release their energy to the Calvin Cycle?
F – The Calvin Cycle of Photosynthesis
Calvin Cycle Penny Activity
Copy the Calvin Cycle Diagram 8-11 on p. 212
Copy only C’s , arrows, ATP/ADP’s, NADPH/NADP+ and blue headings (A-D)
Not the text under the blue headings.
Show the cycle with the (36) Pennies – heads are “energized” and tails are not
Be prepared to pass a verbal quiz
You will need Mr. Ogren’s signature for Parts E and F.