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Transport of Materials
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Transport of Materials

World of Plants

Standard Grade Biology

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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

Slide 3

 

Xylem

Hollow dead tubes

Water and minerals transported in an upwards direction

Made of lignin

Very strong so help support the plant

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Phloem

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

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Slide 7

 

Stomata

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

Slide 8

 

 

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