Transport of Materials World of Plants Standard Grade Biology
Need for transport systems
Plants need sugars and water to stay alive
Water needs to travel from the roots to the leaves Sugars need to travel from the leaves to the rest of the plant
Hollow dead tubes
Water and minerals transported in an upwards direction
Made of lignin
Very strong so help support the plant
Transports sugar around plant
Made of living cells
Companion cells provide the energy for the tube cells.
The end walls of the tube cells have pores through which food is transported from cell to cell in the form of dissolved sugars
Tiny pores found on the surfaces of a leaf
Stomata take in carbon dioxide from the air through stomata
Water vapour passes out from the leaf to the atmosphere through stomata
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