Photosynthesis Review
Objective: to review the process of photosynthesis, its reactions and its purpose.
This review is your study guide for the test.
Directions: Using mostly your notes, and textbook when necessary, work on the study objectives below. In some cases there are questions to answer or diagrams to draw and label. (There will be diagrams to label on the test.)
**If you finish early, you can make notecards to study or quiz yourselves in groups of two or three only.
Study the general equation for photosynthesis and be able to indicate in which process each reactant is used and each product is produced.
6H2O + 6CO2 + light energy ----> C6H12O6+ 6O2
the chemical equation translates as:
six molecules of water plus six molecules of carbon dioxide produce one molecule of sugar plus six molecules of oxygen
1. Where does the water come from? a. What is the water used for?
b. What is the name of the reaction that splits water?
2. Where does the carbon dioxide come from?
a. What lets air enter the leaf?
b. What process allows the carbon dioxide to enter the air spaces inside the leaf?
c. What is the carbon in the carbon dioxide going to become? Photosynthesis Review
d. What is the name of the reaction that uses the carbon dioxide?
3. What is the purpose of the light energy?
4. What is the name for the sugar produced in photosynthesis (C6H12O6)?
a. What is this molecule used for in plants and animals?
5. Where does the Oxygen in our atmosphere come from?
a. What structure in the leaf lets the oxygen out?
b. What process allows the oxygen to move into the atmosphere?
List the two major processes of photosynthesis and state what occurs in those sets of reactions.
1. The first process of photosynthesis is called ______. This reaction occurs in the ______. It requires ______. This energy makes an ______jump out of its place in ______and enter the ______, a series of proteins, embedded in a membrane. As the electron moves down the chain it ______energy. This lost energy is used to create ______molecules that will be used to run the ______. When the electron leaves the electron transport chain it is captured by NADP+ and the molecule is changed into ______. The NADPH and the ATP will then move to the ______of the chloroplast to provide energy to run the Calvin Cycle. Electrons that are lost in the process are replaced from a ______Photosynthesis Review
molecule. It is split in a reaction called ______. This is how oxygen molecules are produced as a by-product of photosynthesis.
2. The second part of photosynthesis occurs in the ______and it is called the Calvin Cycle. This part is also known as the ______or the dark reaction. The goal of this reaction is to create a sugar called ______. ATP and ______from the light reaction are necessary for this step, as well as ______from the atmosphere. ______“turns” of the Calvin cycle will create one glucose molecule.
Distinguish between organisms known as autotrophs and those known as heterotrophs. 1. An autotroph:
2. A heterotroph:
3. Why is this important when we talk about photosynthesis?
Draw and label a chloroplast. (stroma, thylakoid, granum stack)
Describe pigments, and the role that chlorophyll found in chloroplasts plays to initiate the light- dependent reactions. 1. Pigments are defined as:
2. What wavelengths of the visible spectrum of light are absorbed by a blue shirt?
3. What wavelengths are absorbed by a black shirt? Photosynthesis Review
4. A white shirt?
5. If you wanted to grow plants indoors, what color light bulb would you want to AVIOD using? Why?
What is the function of the:
o Cuticle
o Xylem
o Phloem
o Guard cell
o Stomata
o Lower and upper epidermis
o Mesophyll layer
o Air pocket
When you are testing for starch, iodine is a good indicator
o What did we test first to show that iodine changes color in the presence of starch?
o What color were we looking for?
o Why the color change prove that photosynthesis occurred?
Draw a plant, label where water goes, Carbon dioxide goes and oxygen goes. Photosynthesis Review
Study your plant structure diagram. Be able to label the cuticle, the upper and lower epidermis, the stomata, a chloroplast and a guard cell.