05 plant cells, tissues and organs

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  • Transport cell – conducting vessel element in mahogany woodGuard cellPhotosynthetic cellEpidermal cell (root hair of tomato)
  • 05 plant cells, tissues and organs

    1. 1. Plant Cells, Tissues and Organs
    2. 2. Cell Specialization & Cell Differentiation http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookplantanat.html http://earthsky.org/human-world/nate-lewis-on-artificialphotosynthesis http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookplantanat.html http://www-plb.ucdavis.edu/labs/rost/tomato/Roots/rootcell.html
    3. 3. Specialized Cells & Tissues in Plants Tissue: group of specialized cells  Organ: Group of several types of tissues working towards a specific function  Meristem: unspecialized cell that can form specialized cells in plants 
    4. 4. Tissues in Plants
    5. 5. Repairing & Replacing Specialized Cells  Buds: Swelling of the stem ◦ Terminal Bud – most active growth, produce Auxin ◦ Lateral Bud – dormant regions, inhibited by Auxin
    6. 6. Plant Organs Leaf  Stem  Root  Flower 
    7. 7. The Leaf Dermal tissue  Palisade tissue  Mesophyll tissue  Vascular bundles 
    8. 8. The Leaf – Tissues  Dermal tissue ◦ Waxy cuticle – limits water loss ◦ Protects the leaf  Palisade tissue ◦ Prime site of photosynthesis – palisade cells and chloroplast  Mesophyll tissue ◦ Loosely packed cells ◦ Spaces contain gases such as H2O, CO2 and O2  Vascular tissue ◦ Xylem – transports water to the photosynthesizing cells ◦ Phloem – transports sugar throughout the plant ◦ Small vein branches – every cell gets water and nutrients
    9. 9. The Leaf – Lower epidermis   Exchange of gases Guard cells ◦ Control opening and closing of stomata  Stomata ◦ Connected to spongy mesophyll ◦ CO2 enters, O2 and H2O exits through them  Transpiration – evaporation of water from leaves
    10. 10. Chloroplast
    11. 11. The Stem Provides physical support and transports sap  Composed mainly of xylem tissue  ◦ Dead tubular hollow cells fortified with lignin  Vascular bundle ◦ Phloem (living porous cells) exchanges materials with neighbouring cells
    12. 12. The Roots  Anchor a plant to the ground  Allow water and minerals uptake from the soil  Some also act as plant’s storage area
    13. 13. The Roots  Dermal tissue ◦ Root hair – increase surface area for absorption  Ground tissue ◦ Cortex – provide support ◦ Pericycle – vascular tissue
    14. 14. Types of Roots Tap root • Allows plant to reach far underground for water • Anchors the plant Fibrous root • Large surface area to absorb water • Stabilize soil • Prevent erosion & landslides
    15. 15. Plants Under Attack
    16. 16. The Flower Reproduction - pollen and eggs  Pollination: transfer of pollen to female parts of flower  Seeds are produced and embedded in fruits  Hormone called ethylene stimulates ripening of fruits 
    17. 17. Homework   P. 69 # 1, 3, 5 - 7

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