Question

Which of the following does not play any role in the movement of water through the xylem ? 1) Capillarity 2) Root pressure 3) H+/ATPase pump at the xylem element membrane 4) Transpirational pull

Answer 1

Answer:

option 3

Explanation:

root pressure- plant roots absorb the excess of water by an active process and builds up a hydrostatic pressure within the root system, called root pressure. This activity pushes the water upwards all along the length of the stem.

Transpiration -The pulling force that operates on xylem water columns is called Transpiration Pull or Suction Pressure.

Capillary action along with the root pressure, the ascent of sap is mainly due to passive forces that develop within the plant, due to certain environmental factors that act upon the plant. tracheids and vessels of the xylem behave as capillary tubes. Ascent of sap is partly due to the capillarity of these tissues.

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