(6) Plant Cells and Plant Transport Review

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Author:
hayesme
ID:
16378
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(6) Plant Cells and Plant Transport Review
Updated:
2010-04-27 00:43:15
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bio
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bio 102
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  1. dermal
    • covers the surface of plant
    • composed of single layer of cells called epidermis
    • cells are cube shaped and tightly packed together
    • covered by a layer of wax called the cuticle
    • has cell extension (root hairs)
  2. 2 types of vascular tissue
    xylem and phloem
  3. 2 types of xylem tissue
    • tracheids
    • vessels
  4. tracheads
    • type of xylem tissue found in all vascular plants
    • dead at functional maturity
    • has fusiferm shape that allows xylem to move
    • supports plants and conducts xylem sap
    • has primary and secondary cell walls
  5. vessels
    • type of xylem tissue
    • found in angiosperms
    • dead at functional maturity
    • not good for support
    • has primary cell walls
    • more efficient at transfer of xylem sap
  6. 2 types of phloem tissue
    • sieve tube memeber
    • companion cells
  7. sieve tube member
    • type of phloem tissue
    • alive at functional maturity
    • transports xylem sap
    • no nuclei, ribosomes, or vacuole
    • cannot make protein
  8. companion cells
    • type of phloem tissue
    • lies along sieve tube member/element
    • connects with plasmodesmota
    • has nuclei and ribosomes
    • gives protein to sieve tube members
  9. ground tissue system
    fills in space between dermal and vascular tissue, location of metabolic pathways; where photosynthesis occurs
  10. 3 types of ground tissue cells
    • parenchyma
    • collenchyma
    • sclerenchyma
  11. parenchyma
    • type of ground tissue cell
    • alive at functional maturity
    • least specialized=can differentiate
    • has thin primary cell wall
    • never has secondary cell wall
  12. collenchyma
    • type of ground tissue cell
    • alive at functional maturity
    • thick primary cell wall
    • no secondary cell wall
    • supports young growing part of plant
  13. sclerenchyma
    • type of ground tissue cell
    • dead at functional maturity
    • has primary and secondary cell wall
    • supports older parts of the plant
    • 2 types of cells: fibers and sclerids
  14. meristem responsible for sencondary growth
    lateral meristems
  15. secondary growth in shoots
    • product of apical meristem
    • increases girth
    • vascular cambrian creates secondary xylem and phloem
    • cork cambrien
  16. cork cambrien
    • forms cork=parenchyma cells
    • filled with suberin
    • cells divide and produce cork
    • prevents evaporation of water and protects from bugs
  17. root pressure (pushing)
    • weak, only important n smaller plants
    • solutes are actively transported from the soil into the xylem which causes water potential to lower
    • water potential of stele is lower than the cortex in the soil
    • lower wate potential is what causes water to move in because water moves from high to low
    • ex. of root pressure-guttation
  18. transpiration cohesion tension mechansion (pulling)
    energy of sun evaporates water from leaves, creating energy to pull the xylem sap up
  19. transpiration
    • solar powered so no ATP
    • the evaporation provides energy to pull the xylem sap up the plant (pulls minerals and water from the soil to the leaves, also cools them)
  20. cohesion
    • water molecules stick together because of H bond
    • as rate of evaporation increases, changes meniscus curve (affects tension)
  21. tension
    • formed by transpiration
    • a meniscus forms at junction of cells on a hot dry day: rate of transpiration will be higher, which creates tension

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