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Biology - Plant cell organisation - Coggle Diagram
Biology - Plant cell organisation
Plant tissues in the Leaf
Structures
Waxy cuticle
reduces water loss
Upper epidermis
transparent - allow light to pass through
Palisade mesophyll tissue
lots of chloroplast
photosythesis
near top of leaf - most light
Spongy mesophyll
big air spaces to allow gases to diffuse
Lower epidermis
holes
Stoma
let CO2 diffuse out leaf
Guard cell
control opening (flaccid) and closing (turgid) of stomata
Xylem
transport water and mineral ions
roots -> stem and leaves
TRANSPIRATION
Phloem
transports dissolved sugars and nutrients
both directions
TRANSLOCATION
Organs
Leaf
main site of photosynthesis
Stem
support leaves
enables transport of H2O, sugars..
Root
site of absorption of H2O, mineral ions..
anchor the plant
Stomata
Guard cells control opening and closing of stomata
plant has lots of water
guard cells fill with it
plump and Turgid
opens stomata for photosynthesis (gas exchange)
plant is short of water
guard cells lose water
Flaccid
closed stomata
stops water vapour escaping
sensitive to light
close at night
more stomata on underside of leaves
shaded and cooler
less water lost