Transport in plants

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  • Transport In Plants
    • Xylem and Phloem
      • Specialised Plant Cells
      • Both types of tissue are continuous from the root, up the stem and into the leaf
      • Form vascular bundles in broad leaved plants
      • Xylem cells carry water and minerals from the roots up through the stem, and are therefore involved in Transpiration
      • Phloem cells carry food substances such as sugars up and down stems to growing and storage tissues, this is called Translocation
      • The xylem cells are vessels. They are dead cells have the lack in living cytoplasm leaves a hollow lumen. Their cellulose walls have extra thickening  of lignin, giving great structure and support
      • Phloem cells are living and arranged in columns
    • Transpiration
      • The evaporation and diffusion of water from inside the leaves
        • This loss of water helps to create a continuous flow of water from the roots to the leaves for xylem cells
      • Root hairs are projections on root hair cells which increases the surface area for more intake of water by osmosis
      • Ensures that plants have enough water for:
        • cooling by evaporation
        • photosynthesis and support from cell's turgor pressure
        • Transport of minerals
      • The rate of transpiration is increased by:
        • an increase in light intensity
        • an increase in temperature
        • an increase in air movement
        • a decrease in humidity
      • Leaf structure is adapted to prevent too much water loss, which can cause wilting

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