Download 4.2 Study Guide KEY

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OVERVIEW OF PHOTOSYNTHESIS
Study Guide
KEY CONCEPT
VOCABULARY
The overall process of photosynthesis
produces sugars that store chemical
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chlorophyll
lightindependent reactions
energy.
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MAIN IDEA: Photosynthetic organisms are producers.
1. Why are some organisms called producers?
They produce the source of chemical energy fro themselves and other organisms.
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What is the function of photosynthesis?
To capture light energy to make sugars that store chemical energy.
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What is chlorophyll?
A molecule in chloroplasts that absorbs some of the energy in visible light.
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MAIN IDEA: Photosynthesis in plants occurs in chloroplasts.
4.
What are chloroplasts?
Membrane bound organelles where photosynthesis takes place.
5.
In which t\ryo parts of a chloroplast does photosynthesis take place?
Stoma and grana
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What are thylakoids?
coin-shaped membrane enclosed compartments inside the grana.
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7. Write the chemical equation for the overall process of photosynthesis, Then explain
what the equation means and identify the reactants, products, and the meaning of the
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6CO2 + 6 H20-->C6H1206
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Carbon Dioxide and water enter photosynthesis. Through many chemical reactions, and help of enzymes
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a 6-carbon sugar and oxygen are formed.
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What are the differences between the light-dependent reactions and the light-independent
reactions?
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The light-dependent reactions require light and they absorb and transfer energy. The light independent reactions
do not directly need light and they build sugars.
Unit 2 Resource Book
McDougal Littell Biology
Study Guide
35
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STUDY GUIDE, CONTINUED
Use the space below to sketch and label a chloroplast. On the sketch, write the four steps
the photosynthesis process.
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1. Sunlight, Oxygen is released
2. Electrons down transport system to light reactions
3. Carbon Dioxide added to build sugars
4. Sugar is formed
Vocabulary Gheck
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The prefix photo- means "light," and synthesis means "to put together." How do those
meanings tell you what happens during photosynthesis?
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Energy from light is used to put sugars together
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1O. The prefix chloro- means "green," and the suffix -phyll means "leaf." How are these
meanings related to chlorophyll?
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Chlorophyll is the light absorbing molecules making leaves look green.
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11. The prefix ln- means "not." How does this meaning tell you which reactions in
photosynthesis require light, and which reactions do not?
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The light dependent reactions require sunlight; the light independent reactions can occur without sunlight.
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36 Study Guide
Unit 2 Resource Book
McDougal Linell Biology