Plant Powerpoint Plants Position

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Plant Powerpoint Plants Position Powered By Docstoc
					Plants

 Structure –
         Leaves
         stem
         roots
Leaves
Function of leaves

  Trap light energy for photosynthesis

 Producing sugar from photosynthesis

  Exchange of gases –
          oxygen and carbon dioxide
Structure
Wide
Helps to catch more light
  energy


Thin
Help get carbon dioxide
  from bottom to top of
  leaf for photosynthesis
Leaf structure
                 Greener on top




                   CO2 gets in
                   here
Leaf diagram – palisade layer

Most
chlorophyll




                     CO2
Leaf cell -
palisade
   Position?
Upper surface of
       leaf
   Features?
  Box shape
 Chloroplasts
   Function?
 Photosynthesis
Gas exchange

  Leaves are designed to allow carbon
   dioxide to get to the main chlorophyll
   layer at the top of the leaf
  They have small holes called stomata on
   the under surface
  Each hole is open & closed by 2 guard
   cells
Leaf diagram –
   stoma and guard cells
Stoma position
 Stoma is a small hole
Its size is controlled by 2 guard cells




       closed          open
Stoma function is for gas
exchange in the leaf

  Guard              oxygen
  cell

                     Provided plant is
                     photosynthesising




                     Carbon
                     dioxide
Stomata open and
close at different
times of the day


When it is light the
plant needs CO2 for
photosynthesis so
the stoma open


At night (darkness)
they close
Gas exchange
Roots – function and
structure
 Hold plant in position
 Absorb water and minerals
  from the soil
 Specialised cells to increase
  surface area for water intake
Wheat
seed
Root hairs
Fragile parts of
cells that grow
from the main root


They massively
increase the
surface area for
absorption
Root hair cells   (x150)
Root ‘B’ has had
the hairs damaged -
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Description: Plant Powerpoint Plants Position