plant organisation

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Cards (25)

  • describe leaf
    organ
  • describe function of leaf
    site of photosynthesis
  • give plant tissues of leaf
    epidermal, palisade mesophyll, spongy mesophyll, xylem and phloem
  • describe epidermal tissue
    found in upper and lower epidermis
  • describe adaptations of upper epidermal
    transparent - let light through for photosynthesis
  • describe adaptations of palisade mesophyll
    lots of chloroplasts - maximise photosynthesis
  • describe adaptations of spongy mesophyll
    lots of air gaps - allow gases to diffuse through to palisade mesophyll
  • describe adaptations of lower epidermis
    stomata and guard cells - control gas exchange and water loss
  • describe function of stomata
    gaps to allow diffusion of gases (carbon dioxide for photosynthesis)
  • describe function of guard cells
    control opening and closing of stomata due to environmental conditions
  • give environmental conditions affect guard cells
    water availability and light intensity
  • describe affect of water availability on guard cells
    low - flaccid and close stomata
    high - turgid and open stomata
  • describe affect of light intensity on guard cells
    low - closed stomata
    high - open stomata
  • describe function of phloem
    transport dissolved sugars from leaves to rest of plant
  • give adaptations of phloem
    elongated living cells, pores in end walls and both direction flow
  • describe translocation
    transport of dissolved sugars from leaf to rest of plant
  • describe function of xylem
    transport water and mineral ions from roots to stems and leaves
  • give adaptations of xylem
    dead cells, join end to end to form hollow tube, strengthened by lignin and one direction flow
  • describe transpiration
    evaporation of water from plant surface
  • describe transpiration stream
    movement of water from roots to leaves
  • give factors affecting transpiration
    temperature, light intensity, air movement and humidity
  • describe affect of temperature on transpiration
    high - increase rate
    low - decrease rate
  • describe affect of light intensity on transpiration
    low - decrease rate
    high - increase rate
  • describe affect of air movement on transpiration
    low - decrease rate
    high - increase rate
  • describe affect of humidity on transpiration
    low - increase rate
    high - decrease rate