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Photosynthesis

Photosynthesis. Investigation One. Photosynthesis. Plant Cell. Plant cells are slightly different from animal cells Contain most of the same organelles plus a few more Cell wall: rigid outer border of the cell to keep it intact

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Photosynthesis

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  1. Photosynthesis

  2. Investigation One Photosynthesis

  3. Plant Cell • Plant cells are slightly different from animal cells • Contain most of the same organelles plus a few more • Cell wall: rigid outer border of the cell to keep it intact • Vacuole: large sack of water usually found in the center of the cell • Chloroplasts: location where photosynthesis takes place. The chloroplast contains pigments of chlorophyll

  4. Plant Cell

  5. Chloroplast • Location where photosynthesis takes place • Contains pigments of chlorophyll and carotenoids needed for photosynthesis • Chlorophyll absorbs different wavelengths of color reflecting the green, thus leaves appear green

  6. Chloroplast • Thylakoid and Stroma – stacks of chlorophyll pigments

  7. Photosynthesis • A process in which energy derived from light is converted into energy of chemical bonds • Carried out by bacteria, algae, and higher order plants • Consists of Light and Dark Reactions • Light-day (ample sunlight) • Dark- night (little to no sunlight)

  8. Photosynthesis

  9. Chromatography • Can separate different pigments that are found in green plants • Using a liquid solvent separates the chlorophyll and carotenoid pigments on a piece of filter paper

  10. Investigation Two Photosynthesis

  11. Photosynthesis • Energy from light is converted into energy of chemical bonds • Photosynthesis reduces carbon dioxide to three-carbon sugars and oxidizes water to oxygen

  12. Photosynthesis • Reactants in the reaction are • Carbon dioxide gas(CO₂) • Water (H₂O) • The products from the reaction are • Oxygen (O₂) • Sugar molecule (C₆H₁₂O₆, glucose, carbohydrate) • Reactants are found on the left and the Products on the right

  13. Photosynthesis- Aquatic Plants • During photosynthesis for aquatic plants as the plant uses more carbon dioxide in the water the water around the plant becomes less acidic

  14. Light and Photosynthesis affect CO₂ Levels • Light is necessary for photosynthesis • In the presence of light, CO₂ levels decreased in water that contains aquatic plants • This indicates that CO₂ is used in the process of photosynthesis

  15. Light and Photosynthesis affect O₂ Levels • Light is necessary for photosynthesis • In the presence of light, O₂ levels increase in water containing aquatic plants • This indicates that O₂ is a product of Photosynthesis

  16. Investigation Three Photosynthesis

  17. Photosynthesis -Products Sugar O₂ (Oxygen) Other living organisms use O₂ ti live and breath • Plants use the Chemical bond energy of the Sugars as an energy source • They use the energy to live and grow • Other organisms will eat the plants and they use the energy in the same way- to live and grow

  18. Photosynthesis- Light • Light from the SUN is needed for plants and other organisms to carry out the process • Without light photosynthesis cannot occur

  19. Plant Structure • Two main structures • Stem • Leaf • The cells within these structures contain chloroplast that hold the green chlorophyll pigments that are needed for photosynthesis

  20. Importance of Light • Without light O₂ and sugar are not produced

  21. Parts of the Plants where Photosynthesis Occurs • Both structures contain chloroplasts; therefore, it occurs in both places • However, more chloroplasts can be found in the leaves indicating that more Photosynthesis occurs in the leaf of a plant

  22. Investigation Four Photosynthesis

  23. Photosynthesis Products • Sugars that are produced during Photosynthesis are not always used right away • The plants will store the sugars in the form of starch so that the chemical bond energy is not wasted • Starch is a long chain of individual sugar molecules that are banded together • When the plant needs energy the sugar molecules are released from the starch • Starch is stored in the leaves where photosynthesis takes place

  24. Photosynthesis Location and Pigments • Photosynthesis takes place in the chloroplasts where the chlorophyll is located • The chlorophyll contains the green pigment that is needed for photosynthesis

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