Date post: | 24-Dec-2015 |
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PlantsPlants
StructureStructure – –
LeavesLeaves
stem stem
rootsroots
LeavesLeaves
Function of leavesFunction of leaves
Trap light energy for photosynthesisTrap light energy for photosynthesis
Producing sugar from photosynthesisProducing sugar from photosynthesis
Exchange of gases – Exchange of gases – oxygen and carbon dioxideoxygen and carbon dioxide
StructureStructureWide
Helps to catch more light energy
Thin
Help get carbon dioxide from bottom to top of leaf for photosynthesis
Leaf structureLeaf structure
Greener on top
CO2 gets in here
Leaf diagram – palisade layerLeaf diagram – palisade layer
CO2
Most chlorophyll
Leaf cell - Leaf cell - palisadepalisade
Position?Position?
Upper surface of Upper surface of leafleaf
Features?Features?
Box shapeBox shape
ChloroplastsChloroplasts
Function?Function?PhotosynthesisPhotosynthesis
Gas exchange Gas exchange
Leaves are designed to allow carbon Leaves are designed to allow carbon dioxide to get to the main chlorophyll dioxide to get to the main chlorophyll layer at the top of the leaflayer at the top of the leaf
They have small holes called stomata on They have small holes called stomata on the under surfacethe under surface
Each hole is open & closed by 2 guard Each hole is open & closed by 2 guard cells cells
Leaf diagram – Leaf diagram – stoma and guard cellsstoma and guard cells
Stoma positionStoma position
Stoma is a small holeStoma is a small holeIts size is controlled by 2 guard cells
closed open
Stoma function is for gas Stoma function is for gas exchange in the leafexchange in the leaf
Carbon dioxide
oxygenGuard cell
Provided plant is photosynthesising
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 exchangeGas exchange
Roots – function and Roots – function and structurestructure
Hold plant in positionHold plant in position Absorb water and minerals Absorb water and minerals
from the soilfrom the soil Specialised cells to increase Specialised cells to increase
surface area for water intakesurface area for water intake
Wheat Wheat seedseed
Root hairs
Fragile parts of cells that grow from the main root
They massively increase the surface area for absorption
Root hair cells Root hair cells (x150)(x150)
Root ‘B’ has had the hairs damaged -
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