Photosynthesis! - PowerPoint PPT Presentation

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Photosynthesis!

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  1. Photosynthesis!

  2. Photosynthesis • Photosynthesis • Chemical process • Plants absorb sunlight • Convert light energy into stored chemical energy • Why do plants need this energy?

  3. Where it happens • Photosynthesis occurs in green pigments • Called chlorophyll • Found in chloroplasts • Usually found in mesophyll tissue of leaves • Each mesophyll cell contains between 20-100 chloroplasts Xylem &Phloem

  4. Chloroplasts • Chloroplasts have membrane to contain the fluid inside • Fluid-filled area is called Stroma • It contains enzymes needed for photosynthetic reactions

  5. Chloroplasts • Also inside chloroplasts: • Thylakoids • Set of interconnected flat, disk-like sacs • A stack of them that look like a stack of coins are called Grana

  6. Chlorophyll • Chlorophyll is a complex molecule • Main pigment of photosynthesis • Three pigments are needed for photosynthesis

  7. Chlorophyll • Chlorophyll a • Bright green • Absorbs energy from a specific range of light • Violet-blue to red and red-orange wavelengths • Initiates light dependant reactions

  8. Chlorophyll • Chlorophyll b • Yellow green in color • Absorbs light wavelengths slightly different than Chlorophyll a • Carotenoids • Yellow and orange in color • Absorb energy from green-yellow-orange wavelengths • Energy absorbed can be transferred to Chlorophyll a

  9. Process of Photosynthesis • Trap light energy • Convert light energy into chemical energy • That is it • Then the plant can use the chemical energy(sugar) to grow

  10. Process of Photosynthesis • What traps the light energy? • chlorophyll • That energy is used to manufacture high-energy compounds • What is a compound? • ATP, NADPH • Adenosine triphosphate • Nicotinamide adenine dinucleotide phosphate

  11. Process of Photosynthesis • The ATP and NADPH are then used to make carbohydrates • Sugar, Starch, Cellulose • Sugar and starch are the cells’ energy source • Cellulose is what makes up cell walls in plant cells • Watch it

  12. Process of Photosynthesis • Two main reactions in the process of photosynthesis