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Photosynthesis

Photosynthesis. Provides Energy to make LIFE possible!. What is Photosynthesis?. Photosynthesis is a chemical reaction in which light energy is converted to chemical energy (stored in glucose).  Photosynthesis = chemical reaction

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Photosynthesis

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  1. Photosynthesis Provides Energy to make LIFE possible!

  2. What is Photosynthesis? • Photosynthesis is a chemical reaction in which light energy is converted to chemical energy (stored in glucose).  Photosynthesis = chemical reaction Light E  Chemical E (stored in glucose) • Living things can eat glucose, we can't eat sunlight.

  3. Why is Photosynthesis important? • Converts Energy into a form that makes LIFE possible! • Living things can't eat sunlight, but they can eat glucose!

  4. Who carries out photosynthesis? • Autotrophes containing the green pigment, chlorophyll.  • This includes: • The plant kingdom, • “Half" of the Protista (the algae) • “Half" the Moneran Kingdom (the blue-green algae).

  5. Where does photosynthesis occur? Most photosynthesis is occurring in the oceans! (The ocean covers 70% Earth) leaves of plants.  chloroplasts

  6. How can we summarize photosynthesis? In words: carbon dioxide + water + light energy  glucose + oxygen + water As a chemical reaction: CO2 + H2O + light energy  C6H12O6 + O2 + H2O

  7. What raw materials are needed for the process of photosynthesis? chlorophyll Sunlight water carbon dioxide

  8. How does the structure of a plant help maintain homeostasis? • Sunlight • Absorbed by the chlorophyll in each chloroplast! • Chloroplasts are found in the Palisade layer of a leaf!

  9. CO2 diffuses in through the stomata O2diffuses out through the stomata

  10. H2O is taken in through the xylem tissue H2O transpires (exits) through the stomata

  11. Glucose produced during photosynthesis is pushed through the phloem to other parts of the plant that needs food!

  12. Reactants of Photosynthesis

  13. Products of Photosynthesis

  14. More in-depth… • Inside a chloroplast…Light Dependent Reaction • Thylakoids are arranged in stacks called grana. • The chlorophyll inside the grana absorbs light – blue and red. • Water and O2 is absorbed. • ATP is produced.

  15. ADP ATP Light Independent Reaction (Dark Reaction) (Calvin Cycle) Uses CO2 and ATP to produce high energy sugar.

  16. Factors that affect the rate of photosynthesis… • Amount of water available • Temperature (Enzymes! 0-35 °C) • Intensity of light (not too much, not too little!)

  17. How do plants maintain homeostasis? Cuticle – prevents water loss guard cells

  18. Exactly why is photosynthesis so important? Two big reasons:  glucose (sugar) oxygen

  19. What else is so great about sugar? Dehydration synthesis = cellulose starch

  20. To which "life function" is photosynthesis related? nutrition, autotrophic nutrition Nutrition = how organisms obtain the materials necessary for energy, growth, etc.  Autotrophic Nutrition

  21. What else should we remember about photosynthesis? • Oxygen-Carbon Dioxide Cycle.  • oxygen factories • removing CO2 from the atmosphere.  • Increasing levels of CO2 = increasing global temperature ("Global Warming") • Damaging the ecosystems where photosynthesis occurs (i.e. the rainforests, the oceans)… • Reduces O2 being produced • Reduces CO2 being removed

  22. Energy formed stored in bonds of ATP (adenine triphosphate)

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