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Bella Nat 5

U2 KA 5 - Transport systems Plants

TermDefinition
Leaf vein transport tissue in plants, made up of xylem and phloem
Transpiration the movement of water from roots to being lost from leaves
Evaporation Liquid water changes to water vapour
Stomata holes in leaves where water is lost by evaporation and gas exchange takes place. Made of guard cells and stoma.
Guard cells control the opening and closing of the stoma
Stoma the hole where gas exchange takes place
Palisade mesophyll main photosynthetic cells in a leaf, large cells arranged at top of leaf to collect the most light
Spongy mesophyll photosynthetic cells found below palisade mesophyll in leaf, surrounded by air spaces
Upper epidermis upper surface of leaf, transparent cells to allow light through to photosynthetic cells
Lower epidermis lower surface of leaf, contains the stomata
Root hairs increase surface area for water absorption in the soil
Xylem transport tissue for water and minerals from the soil. Dead, hollow tubes thickened with spirals of lignin. Common name is wood.
Phloem transport tissue for sugar. Sieve tube attached to companion cell.
Lignin provides support to Xylem
Sieve plate part of phloem vessel, perforated end walls of column of cells allows cytoplasm to flow between containing the dissolved sugar.
Companion cell part of the phloem vessel, connected to sieve tube, controls the cell, allowing it to live even though it has no nucleus
Created by: nscobie
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