Plant Leaf Structure and Function
Discover the intricate details of plant leaves, from their structure to their vital role in photosynthesis. Explore how leaves trap light energy, produce sugar, and exchange gases to support plant growth and survival. Delve into the design of leaves that enables efficient gas exchange and the important role of stomata in regulating this process. Uncover the anatomy of leaf cells and the positioning of chlorophyll-rich layers for optimal photosynthetic activity.
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Presentation Transcript
Plants Plants Structure Leaves stem roots
Leaves Leaves
Function of leaves Function of leaves Trap light energy for photosynthesis Producing sugar from photosynthesis Exchange of gases oxygen and carbon dioxide
Structure Structure Wide Helps to catch more light energy Thin Help get carbon dioxide from bottom to top of leaf for photosynthesis
Leaf structure Leaf structure Greener on top CO2 gets in here
Leaf diagram Leaf diagram palisade layer palisade layer Most chlorophyll CO2
Leaf cell Leaf cell - - palisade palisade Position? Upper surface of leaf Features? Box shape Chloroplasts Function? Photosynthesis
Gas exchange 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 Leaf diagram stoma and guard cells stoma and guard cells
Stoma position Stoma position
Stoma is a small hole Stoma is a small hole Its size is controlled by 2 guard cells closed open
Stoma function is for gas Stoma function is for gas exchange in the leaf exchange in the leaf oxygen Guard 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 Gas exchange
Roots Roots function and function and structure structure Hold plant in position Absorb water and minerals from the soil Specialised cells to increase surface area for water intake
Wheat Wheat seed seed 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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