why the direction of water in xylem is always in unidirectional motion
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Movement of water through the xylem is caused by root pressure, capillary action and mainly via transpirational pull. All these factors results in a net upward movement of water molecules through the xylem vessel.
In the phloem, movement is multidirectional because of the presence of companion cells. These companion cells have many mitochondria that can carry out aerobic respiration to provide sufficient energy for active transport of substances in the desired direction.
The xylem vessel has no protoplasm, hence water cannot move due to active transport — hence it can only go upwards.
In the phloem, movement is multidirectional because of the presence of companion cells. These companion cells have many mitochondria that can carry out aerobic respiration to provide sufficient energy for active transport of substances in the desired direction.
The xylem vessel has no protoplasm, hence water cannot move due to active transport — hence it can only go upwards.
Tejesvi:
thankyou
wlcm
well i got. a dout that does transpiration helps xylem to transport water more faster..??
no
but why ?
due to transpiration suction is created which help xylem to transport water more fast..
ri8
transpiration is loss of water
i knw but when water is loss due to evaporation which creates suction area and help xylem to pull water from downwards..
more fastly
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because the water is transported from roots to all parts of body
hence it only moves in one direction which is upwards
but phloem is bi directional as it transports food from leaves to upper parts of plant and lower parts of plant
hence it only moves in one direction which is upwards
but phloem is bi directional as it transports food from leaves to upper parts of plant and lower parts of plant
i think ur answer is quite brilliant...
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