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Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
Photosynthesis 100503122339-phpapp01
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Photosynthesis 100503122339-phpapp01

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  • 1. Photosynthesis
  • 2. Contents What is photosynthesis? Overview Where does photosynthesis occur?(Leaf) Structure of leaf Why do plants need photosynthesis? Requirements Photosynthesis: the chemical process Benefits of photosynthesis
  • 3. What is photosynthesis? The biochemical process in which sun light fixes carbon dioxide into glucose in the presence of water is called photosynthesis.
  • 4. Photosynthesis in Overview • Process by which plants and other autotrophs store the energy of sunlight into sugars. • Requires sunlight, water, and carbon dioxide. • Overall equation: 6 CO2 + 6 H20 + sunlight  C6H12O6 + 6 O2 • Occurs in the leaves of plants in organelles called chloroplasts.
  • 5. Where does photosynthesis occur? • Photosynthesis occurs in the leaves of a plant.
  • 6. Leaf Structure • Most photosynthesis occurs in the palisade layer. • Gas exchange of CO2 and O2 occurs at openings called stomata surrounded by guard cells on the lower leaf surface. Palisade Spongy
  • 7. Chloroplast Structure • Inner membrane called the thylakoid membrane. • Thickened regions called thylakoids. A stack of thylakoids is called a granum. (Plural – grana) • Stroma is a liquid surrounding the thylakoids.
  • 8. Pigments • Chlorophyll A is the most important photosynthetic pigment. • Other pigments called antenna or accessory pigments are also present in the leaf. – Chlorophyll B – Carotenoids (orange / red) – Xanthophylls (yellow / brown) • These pigments are embedded in the membranes of the chloroplast in groups called photosystems.
  • 9. Why do plants need photosynthesis? • Glucose is the food for the plant. It gives the plant energy to grow. • They do photosynthesis to gain energy.
  • 10. Requirements for photosynthesis to occur. • • • • Light Carbon Dioxide Water But the most important among these is sunlight
  • 11. Photosynthesis: The Chemical Process • Photosynthesis is a chemical process. • It occurs in two main phases. – Light reactions – Dark reactions (the Calvin Cycle)
  • 12. Light Reactions • Light-dependent reactions occur on the thylakoid membranes. – Light and water are required for this process. – Light reactions are the “photo” part of photosynthesis. – Light is absorbed by pigments and is transformed into ATP and NADPH molecules
  • 13. Dark Reactions • Dark reactions (light-independent) occur in the stroma. – Dark reactions are the synthesis parts of photosynthesis – Trapped energy by pigments is converted into chemical ennergy – Carbon dioxide is “fixed” into glucose – ATP and NADPH molecules created during the reaction is responsible for production of this glucose
  • 14. EQUATION FOR PHOTOSYNTHESIS WATER 6CO2 + 6H2O + ENERGY CARBON DIOXIDE OXYGEN C6H12O6 + GLUCOSE 6O2
  • 15. How much glucose does a plant make? • Plants make enough glucose to be used during the night and on cloudy days when they don’t get sunlight • The extra glucose is stored in the plant’s leaves and other parts.
  • 16. Advantages Basic source of energy for all livings Production of oxygen Healthy environment Lessen global warming
  • 17. PHOTOSYNTHESIS AND LIFE • During the process of photosynthesis, oxygen is produced. We use this oxygen to breathe.
  • 18. photosynthesis and respiration SUN RADIANT ENERGY PHOTOSYNTHESIS GLUCOSE RESPIRATION CELL ACTIVITIES ATP(ENERGY)
  • 19. Photosynthesis and Respiration CARBON DIOXIDE GLUCOSE C6H12O6 + 6O2 OXYGEN ATP 6CO2 + 6H2O + ENERGY WATER

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