948533
Description
Mind Map by jackmackinder19, updated more than 1 year ago
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Created by jackmackinder19
almost 11 years ago
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Water transport in plants
- Routes through the root
- Symplast pathway -
through the living part
of the cell, the
cytoplasm, connected
by the
plasmodesmata
- Apoplast pathway - through the non living
parts of the root - the cell wall. Water can
simply diffuse through the walls as well as
passing through the space between them.
When the water reaches the endodermis its
path is blocked by casparian strips and now
has the take the smyplast pathway
- Symplast pathway -
through the living part
of the cell, the
cytoplasm, connected
by the
plasmodesmata
- Water enters a
plant through root
hair cells
- Has to get into the
xylem - the system of
vessels that
transports the water
throughout the plant
- The bit of the root that
absorbs the water is
covered in root hairs,
greatly increases
surface area
- Once absorbed water
has to got through the
cortex, including the
endodermis before it
can reach the xylem
- Once absorbed water
has to got through the
cortex, including the
endodermis before it
can reach the xylem
- Water always moves from high WP to
low WP, generally the soil has a high
WP and the leaves a low WP creating a
WP gradient to keep water moving from
root to tip
- Has to get into the
xylem - the system of
vessels that
transports the water
throughout the plant
- Water moves up a
plant against the
force of gravity
- Root pressure
- In the root, cells of the
endodermis actively
transport salts into xylem
- These dissolve
and lower WP
in xylem
- Water is drawn into xylem and creates a
small pressure called root pressure. This
may help water move up roots and stems
in small plants. However it is too low to be
of any use in big trees
- Water is drawn into xylem and creates a
small pressure called root pressure. This
may help water move up roots and stems
in small plants. However it is too low to be
of any use in big trees
- These dissolve
and lower WP
in xylem
- In the root, cells of the
endodermis actively
transport salts into xylem
- Cohesion tension theory
- Water evaporates from
leaves at the 'top' of the
xylem
- This creates tension
(suction) which moves
more water into the
leaves
- Water molecules are
cohesive (stick together) so
when some are pulled into
the leaf others follow. This
means the whole column of
water in the xylem from the
leaves down to the roots
moves upwards
- Water enters
the steam
through the
roots
- Water enters
the steam
through the
roots
- Water molecules are
cohesive (stick together) so
when some are pulled into
the leaf others follow. This
means the whole column of
water in the xylem from the
leaves down to the roots
moves upwards
- This creates tension
(suction) which moves
more water into the
leaves
- Water evaporates from
leaves at the 'top' of the
xylem
- Root pressure
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