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Transport of Materials
World of Plants
Standard Grade Biology
Need for transport systems
• Plants need sugars and water to stay
Water needs
to travel
from the
roots to the
Sugars need
to travel
from the
leaves to the
rest of the
• 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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