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Transpiration (Vascular tissue arrangement (Vascular Bundle (Xylem (Dead,…
Transpiration
Vascular tissue arrangement
Vascular Bundle
Phloem
Sieve tubes
Living cylindrical cells joined end to end
Plates
Contains cytoplasm
No nuclei
Companion cells
Small
Have cytoplasm and nuclei
Xylem
Dead
Thick and lignified
No cytoplasm or nuclei
Joined end to end
Continuous running tubes
From roots to stems and to leaves
Cortex
Pith
Epidermis
Importance of transpiration
Cooling effect
Transport of water and minerals
Absorption of water and minerals
Factors affecting the rate of transpiration
Plant factors
Opening of the stomata
Evaporation rate
Diffusion of water vapous
Environmental factors
Relative humidity
Temperature
Air Movement
Light intensity
Water loss?
Aerial parts (stem and leave)
Stomata 90%
Cuticle 10% (Not completely impermeable to gas)
Lenticels (Insignificant amount)