Light Dependent Reactions - Father Son Innovations
Biology Module Yr 1 - 2010
Graphic Organizer
Photosynthesis An Overview of the Light Dependent and Light Independent
Reactions
Light Dependent
Reactions
Take place on the _______________
Light Independent
Reactions
Take place in the _______________
Place the following terms into the proper boxes to make the diagram accurate:
H20 ADP
Carbohydrate
ATP
NADP+
O2
CO2 + H20
NADPH
Place the following terms on the proper lines to make the diagram accurate:
Stroma
Thylakoid membrane
Biology Module Yr 1 - 2010
Questions 1. When does the light dependent reaction occur?
Graphic Organizer
2. When does the light independent reaction occur?
3. What are the resulting products of photosynthesis?
4. What are the reactants (substrates) required for photosynthesis?
5. As long as photosynthesis is occurring, which compound(s) is/are cycled?
6. In your own words, explain the light dependent reaction.
7. In your own words, explain the light independent reaction.
8. Explain why the light dependent-light independent reactions are often called "coupled reactions"
Biology Module Yr 1 - 2010
Graphic Organizer
KEY for Photosynthesis An Overview of the Light Dependent and Light Independent
Reactions
H2O
Light Dependent
O2
Reactions
Take place on the Thylakoid Membrane
ADP
Or NADP+
ATP
NADPH
NADP+
ADP
NADPH
ATP
Light Independent Reactions
Take place in the Stroma
Carbohydrate
CO2 + H20
Place the following terms into the proper boxes to make the diagram accurate.
H20 ADP
Carbohydrate
O2
ATP
NADP+
CO2 + H20 NADPH
Place the following terms on the proper lines to make the diagram accurate.
Stroma
Thylakoid membrane
Biology Module Yr 1 - 2010
Graphic Organizer
KEY for Questions
1. When does the light dependent reaction occur? Anytime the correct wavelengths of light are present for the particular autotroph (plant, algae). 2. When does the light independent reaction occur? Anytime there is enough ATP, NADPH, CO2 and H2O present in the chloroplast. 3. What are the resulting products of photosynthesis? O2 and carbohydrates 4. What the reactants (substrates) of photosynthesis? CO2 and H2O 5. As long as photosynthesis is occurring, which compound(s) is/are cycled? ADP and ATP, NADP+ and NADPH
6. In your own words, explain the light dependent reaction. 1. The light dependent reaction occurs in the presence of light and 2. The light energy breaks down H2O. 3. The H reacts with NADP+ and makes NADPH; 4. The O2 is not needed and is released. 5. The energy also creates ATP from ADP. 6. This reaction takes place on the Thylakoid membrane in the chloroplast. (Many other enzymes and chemicals are present on the membrane). All 6 ideas must be present to get all 6 points, the wording will be different.
7. In your own words, explain the light independent reaction. 1. The light independent reaction can take place with or without light; all that must be present are ATP, NADPH, H2O and CO2 (and of course, many other enzymes and chemicals that are present in the stroma). 2. The ATP to provide energy and NADPH to provide more H's were made 3. During the light dependent reaction, 4. The H2O and CO2 are present in the chloroplast. 5. These reactions take place in the stroma of the chloroplast. 6. Carbohydrates are made that store some of the energy released from the ATP, so ADP is formed and so is NADP+. All 6 ideas must be present to get all 6 points, the wording will be different.
8. Explain why the light dependent-light independent reactions are often called "coupled reactions" The energy that is stored in ATP in the light dependent reaction is used to operate the light independent reaction. One reaction provides the energy for the other reaction.
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