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plantsgeneral - Plants Plants Structure – Leaves Leaves...

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Unformatted text preview: Plants Plants Structure – Leaves Leaves stem roots roots Leaves Leaves Function of leaves Function Trap light energy for photosynthesis Producing sugar from photosynthesis Exchange of gases – Exchange oxygen and carbon dioxide oxygen 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 Greener on top CO2 gets in here Leaf diagram – palisade layer Leaf Most chlorophyll CO2 Leaf cell palisade palisade Position? Upper surface of Upper leaf leaf Features? Box shape Chloroplasts Function? Photosynthesis Gas exchange Leaves are designed to allow carbon Leaves dioxide to get to the main chlorophyll layer at the top of the leaf layer They have small holes called stomata on They the under surface the Each hole is open & closed by 2 guard Each cells Leaf diagram – stoma and guard cells stoma Stoma position Stoma Stoma is a small hole Stoma Its size is controlled by 2 guard cells closed open Stoma function is for gas exchange in the leaf exchange Guard cell oxygen 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 Roots – function and structure Roots Hold plant in position Absorb water and minerals Absorb from the soil from Specialised cells to increase Specialised surface area for water intake surface Wheat seed Wheat Root hairs Fragile parts of cells that grow from the main root They massively increase the surface area for absorption Root hair cells (x150) (x150) Root ‘B’ has had the hairs damaged - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching. ...
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