GCE O'level Ordinary Biology (II. MAINTENANCE AND REGULATION OF LIFE PROCESSES) Mind Map on Transport in Flowering Plants, created by Mactavish on 06/21/2014.
Loss of water
vapour from a
plant, mainly
through the
stomata of the
leaves
Factors
affecting rate
measuring the
rate of water loss
Why?
Draws water and mineral
salts from the roots to the
stem and leaves
Water can be transported to the leaves for
photosynthesis and replace water lost by the
cells. Turgid cells keep the leaves wide and
spread out to trp sunlight for photosynthesis
transpiration pull
wilting
Advantages
Disadvantages
translocation
Xylem
Function
Conducts water and
dissolved mineral salts
from the roots to the
stems and leaves
Provides mechanical
support for the plant
Adaptation
Has an empty lumen
with no protoplasm to
reduce resistance to
water flow
Walls thickened with lignin to
prevent collapse of vessel
Phloem
Function
Conducts manufactured
foods from the green
part of the plant to other
parts of the plant
Adaptation
Has companion vessels with
many mitochondria-Provides
energy for companion cells to
load sugars from mesophyll
cells into sieve tubes by
Active Transport
Holes in sieve tubes to allow rapid
flow of manufactured food substances