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,å r I: k P+rlrxl Nan¡c SECTION 4.2 |-, J J Dr¡t+ OVERVIEW OF PHOTOSYNTHESIS Study Guide KEY CONCEPT VOCABULARY The overall process of photosynthesis produces sugars that store chemical photosynthesis li g chlorophyll lightindependent reactions energy. ht-d epe nde nt rea ctions thyla koid 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. 2. o 9cr o,> ã.3 mm =:p 9¡ What is the function of photosynthesis? To capture light energy to make sugars that store chemical energy. 3. What is chlorophyll? A molecule in chloroplasts that absorbs some of the energy in visible light. (ô 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 t c G E o 6. (J .g What are thylakoids? coin-shaped membrane enclosed compartments inside the grana. + =C 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 c f, I several arrows. õ 6CO2 + 6 H20-->C6H1206 õ Carbon Dioxide and water enter photosynthesis. Through many chemical reactions, and help of enzymes : f o U a 6-carbon sugar and oxygen are formed. @ =o) o o 8. What are the differences between the light-dependent reactions and the light-independent reactions? (_) 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 Name 1¡eriod I)¿te STUDY GUIDE, CONTINUED Use the space below to sketch and label a chloroplast. On the sketch, write the four steps the photosynthesis process. of Photosynthesis g) $b CC c, l¿¡ l¿¡ k: <õ (JË C.) 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 9. C o o E The prefix photo- means "light," and synthesis means "to put together." How do those meanings tell you what happens during photosynthesis? ()o Energy from light is used to put sugars together 5 -,s ç 1O. The prefix chloro- means "green," and the suffix -phyll means "leaf." How are these meanings related to chlorophyll? =q) f o T õF : Chlorophyll is the light absorbing molecules making leaves look green. õ(') J o o 11. The prefix ln- means "not." How does this meaning tell you which reactions in photosynthesis require light, and which reactions do not? Õ @ The light dependent reactions require sunlight; the light independent reactions can occur without sunlight. c o) 'a o ()o 36 Study Guide Unit 2 Resource Book McDougal Linell Biology