B3 - Transport Through Plants Flashcards
What do phloem tubes do?
They transport food substances made in the leaves to growing regions and storage organs of the plant
The transport is in both directions
What is phloem?
It is made from columns of living cells with small holes in the ends to allow food substances to pass through
What do xylem tubes do?
They carry water and minerals from the roots to the stem and leaves in the transpiration stream
What is xylem?
Made of dead cells joined end to end with no end walls between them and a hole down the middle
What is transpiration?
The loss of water from the plant which is caused by evaporation and diffusion of water from inside the leaves
How are the effects of transpiration counterbalanced?
The water is replaced by the steady stream of water from the xylem vessels
What is the transpiration stream?
The continuous cycle of water evaporating off the leaves and being replaced by the roots at the sane rate as it is lost
Why does transpiration happen?
The way that leaves are adapted to perform photosynthesis means that water is lost through the stomata as a side-effect of photosynthesis
What are the 2 types of plant vessel?
Xylem
Phloem
