Plant Growth

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  • Created by: emily3
  • Created on: 21-03-14 12:40
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  • Plant Growth
    • Growth
      • irrevesible increase in the dry mass of an oranism
      • usually increase in cell number
      • uptake of chemicals
      • synthesis of new structures
    • Meristems
      • Apical
        • Primary growth
        • Root & Shoot
        • new cell formed by mitosis
        • becomes elongated, vacuolated, differentiated
      • Lateral
        • secondary growth
        • produced by cambium
    • cambium
      • produced by cambium
      • Produces a ring annually
      • secondary phloem
      • xylem inside
      • phloem outside
      • inactive in winter
      • most active in spring
      • clear rings
        • tree age can be calculated from number of rings
        • yearly conditions can be guessed
          • thick ring
            • mild temperature
            • plenty rainfall
            • plenty sunshine
          • thin ring
            • cold weather
            • drought
            • insect infestation
              • ie caterpillars
  • Large xylem vessels
    • most active in spring
    • able to transport large quantities of water and nutrients
      • for leaf growth and expansion

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