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An Introduction to Photosynthesis

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BENCHMARKS: OBJECTIVES: I will state the overall equation of photosynthesis. I will explain how photosynthesis and cellular respiration are part of an interrelated cycle. I will describe the factors that affect photosynthesis. SC.912.L.14.7* SC.912.L.18.7-Identify the reactants, products, and basic functions of photosynthesis. SC.912.L.18.9*- Explain the interrelated nature of photosynthesis and cellular respiration.

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REVIEW Plants, algae, and some bacteria use light energy from the sun to produce food. They are called photosynthetic autotrophs. Animals, fungi, protozoa, and some bacteria obtain energy from the food they consume. They are called heterotrophs. What are autotrophs and heterotrophs?

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Take Notes Comes from the Greek words: photo – light synthesis – putting together Therefore, it means “using light to put something together” During photosynthesis in the Chloroplasts, plants use energy from sunlight to convert water (H 2 O) and carbon dioxide (CO 2 ) into carbohydrates (C 6 H 12 O 6 ) and oxygen (O 2 ). The energy is now STORED in the carbohydrate molecule. YOU MUST KNOW THIS EQUATION! What is photosynthesis? 6 CO 2 + 6 H 2 O+ light C 6 H 12 O 6 + 6 O 2

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Take Notes How are photosynthesis and cellular respiration related?

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Reactants Products Exergonic or Exothermic Endergonic or Endothermic Atmosphere Sun Glucose (food) Makes muscles work Neurons work Heart work Lose the rest as heat to the environment Notice the sun’s energy enters photosynthesis and is stored in glucose… Animals eat the glucose and use the energy stored by the plants to recharge ATP… we use ATP to run everything in our bodies…ultimately the energy in ATP is used and release as heat… Energy flows… one way Notice that plants take in CO 2 from the atmosphere … make glucose with it… animals eat glucose and release the carbon back into the atmosphere as carbon dioxide … where the plants can use it again… Elements(matter) cycle through the ecosystem

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Reactant or Product? Oxygen Reactant or Product? Sugar Reactant or Product? Water

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http://www.ftexploring.com/phot osyn/chloroplast.html#LEAF Ground Tissue

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Photosynthesis Interactive http://www.pbs.org/wgbh/nova/nature/phot osynthesis.html http://www.pbs.org/wgbh/nova/nature/phot osynthesis.html

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Algae (protist)– eukaryotic and autotrophic like a plant BUT… is unicellular, while all plants are multicellular Algae do not have roots, stems, leaves, flowers, seeds, or cones like plants do– EVERY cell in the algae has to get its own nutrients 3 Groups of Bacteria: Cyanobacteria Chlorobi and Proteobacteria (blue-green) (green) (purple) surface waters deep waters most similar to plants use H 2 S instead of H 2 O First Oxygen

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Think About It What is energy? What are some examples of energy? What is the main source of energy in our planet? Why don’t bushes and other trees usually grow underneath large trees? Why do plants need sunlight to grow? What do we know?

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Independent Practice Flashcards!!

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Make flashcards for the following terms: Products of photosynthesis Reactants of photosynthesis Water’s role in photosynthesis CO 2 ’s role in photosynthesis O 2 ’s role in photosynthesis Sugar’s role in photosynthesis Light’s role in photosynthesis 3 cards on which it says BOOM

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Exit Slip 1.The overall process of photosynthesis can be represented using a chemical equation. Like all chemical equations, the equation for photosynthesis must obey the law of conservation of mass. Which of the following is the correct and balanced equation for photosynthesis? A.CO 2 + H 2 O C 6 H 12 O 6 + O 2 B.6CO 2 + H 2 O C 6 H 12 O 6 + O 2 C.CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 D.6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 What do we know?

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Exit Slip 2. Which of these statements correctly describes the process of photosynthesis? A. Photosynthesis is an exothermic process because it releases energy. B. Photosynthesis is an endothermic process because it releases energy. C. Photosynthesis is an endothermic process because it requires the absorption of energy. D. Photosynthesis is an exothermic process because it requires the absorption of energy. What do we know?

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Exit Slip 3. Which of these best describes the conversion of sunlight into the energy in glucose? A. Chemical energy is converted to kinetic energy. B. Kinetic energy is converted to potential energy. C. Electromagnetic energy is converted to chemical energy. D. Potential energy is converted to electromagnetic energy. What do we know?

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ALOE VERACOLEUSPOTHOSSPIDER PLANT AMOUNT OF CO2 ABSORBED 180 mL168 mL164 mL175 mL AMOUNT OF O2 RELEASED 150 mL Scientists are measuring the rate at which carbon dioxide (CO2) and water are converted to glucose and oxygen (O2) per hour in various types of houseplants with the same biomass. The houseplants are all exposed to the same amount of sunlight and to the same conditions. The data they collect is given in the table. Exit Slip

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What do we know? 4.What is the most likely reason that the plants absorb different amounts of CO2? A.The plants are different heights. B.The plants have different masses. C.The plants have different size leaves. D.The plants are different shades of green. Exit Slip ALOE VERACOLEUSPOTHOSSPIDER PLANT AMOUNT OF CO2 ABSORBED 180 mL168 mL164 mL175 mL AMOUNT OF O2 RELEASED 150 mL

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What do we know? 5.In which process do these plants absorb CO2, water, and sunlight to produce glucose and O2? A.mitosis B.photosynthesis C.replication D.respiration Exit Slip ALOE VERACOLEUSPOTHOSSPIDER PLANT AMOUNT OF CO2 ABSORBED 180 mL168 mL164 mL175 mL AMOUNT OF O2 RELEASED 150 mL

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New Path Learning – http://www.newpathlearning.com/store/by- category/white-board/multimedia-lessons/photosynthesis- respiration-multimedia-lesson-6468.htmlhttp://www.newpathlearning.com/store/by- category/white-board/multimedia-lessons/photosynthesis- respiration-multimedia-lesson-6468.html Elodea Oxygen Bubble Lab – http://www.saddleworth.oldham.sch.uk/science/simulations/wat erweed.htm http://www.saddleworth.oldham.sch.uk/science/simulations/wat erweed.htm Biology Corner – http://www.biologycorner.com/worksheets/waterweed_sim.html http://www.biologycorner.com/worksheets/waterweed_sim.html Photosynthesis Virtual Lab – http://www.syngenta.com/country/uk/en/learning-zone/science- lab/experiments/Pages/Photosynthesis_in_Action.aspx http://www.syngenta.com/country/uk/en/learning-zone/science- lab/experiments/Pages/Photosynthesis_in_Action.aspx

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