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Biology
Transport in Plants
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Translocation
Biology > Transport in Plants
2 cards
Factors Affecting Rate of Transpiration
Biology > Transport in Plants
3 cards
Uptake of Water
Biology > Transport in Plants
5 cards
Cards (19)
Functions of
xylem
and
phloem
:
To
transport
substances from
source
, where they are taken in or made, to the
sinks
, where they are used
To support the
stem
Phloem and xylem in the
leaf
Phloem
and
xylem
in the
stem
Phloem and xylem in the
root
Root hair
cell:
Function: to
absorb
water and minerals from the soil
They have an
elongated
shape for more
surface area
which
increases
the rate of absorption of water by
osmosis
and
ions
by
active transport
Pathway taken by water:
Water enters
root hair
cell from moist soil via
osmosis
because water potential is
higher
in soil than in
cytoplasm.
Water passes through the
cortex
cells by
osmosis
but mostly by
“suction”.
Water and minerals are forced to cross the
endodermis.
Water enters
xylem
then leaves when it gets to
mesophyll
cells
Transpiration
:
evaporation
of water at surfaces of the
mesophyll
cells followed by loss of water
vapour
from plant leaves, through
stomata.
Water leaves
mesophyll
cells, into
air
spaces created by
irregular
shape of
spongy
mesophyll
cells, then diffuses out of the
stomata.
Wilting
: occurs if water
loss
is
greater
than water
uptake
– cells become
flaccid
, tissues become
limp
and plant no longer
supported
See all 19 cards