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Photosynthesis

Discover how autotrophs, such as plants, manufacture their own food through the process of photosynthesis. Learn about the requirements, products, and factors affecting the rate of photosynthesis. Explore the structure and phases involved in this essential process.

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Photosynthesis

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  1. Photosynthesis How autotrophs (plants) manufacture their own food

  2. What is photosynthesis? Photosynthesis is the process by which autotrophsmanufacture their own food (glucose) usingsunlight,carbondioxide and water.

  3. Energy Conversion During the process of photosynthesis, light energyfromthe sun is convertedintochemical energy that can be stored and transported in plants.

  4. Photosynthesis CO2 Requirements for Photosynthesis • Chlorophyllor other pigment(found in autotrophs) • Carbon dioxide(CO2) from the atmosphere • Water(H2O) from the soilor atmosphere • Light, usually as solar energy from the sun

  5. Products of Photosynthesis • Glucose(C6H12O6) - sugar • Oxygengas (O2)

  6. Chemical Equation light 6CO2 + 6H2OC6H12O6+ 6O2 carbon + water glucose + oxygen dioxide In the presence of light energy, six molecules of carbon dioxide combine with six molecules of water to produce one molecule of glucose and six molecules of oxygen.

  7. Factors Affecting the Rate of Photosynthesis 1. Light intensity(very high intensity can damage the chlorophyll) 2. Availability of raw materials (CO2, H2O) 3. Temperature (optimum is 25 -35ºC)

  8. Site of Photosynthesis: The Chloroplast • Photosynthesis takes place in the chloroplasts of plant cells. • It primarily occurs in the leaves.

  9. Structure of a Chloroplast • Thylakoids are the saclike membranes that contain chlorophyll. • A granum is a stack of thylakoids • The stroma is the liquid-filled space inside the chloroplast. granum stroma thylakoids

  10. Two phases of Photosynthesis • Light-dependent phase • Light-independent Phase (Calvin Cycle)

  11. 1. Light-Dependent Phase (take place in thylakoids) a. Light energy is absorbed by chlorophyll and changes into ATP. b. Some ATP is used to split the water molecule (H2O) into hydrogen & oxygen. c. Oxygen (O2) is released into the atmosphere.

  12. Light-Independent Phase (Calvin Cycle) – takes place in stroma • May happen in the light or in the dark a. ATP (from previous phase) and hydrogen (from the water molecule that was split) combine with CO2(from the atmosphere). b. The end result is glucose: C6H12O6

  13. Remember, if you like to eat and breathe…thank a plant!

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