Question

explain the root pressure experiment with a labelled diagram

Answer 1

when the roots of plant absorbs water through diffusion process and soil the roots are held by suction force which creates the water to move upwards this is called ascent of SAP

Answer 2

$\large{\underline{\rm{\pink{Experiment\:to\:prove\:existence\:of\: root\:pressure:-}}}}$

→ Choose a small soft-stemmed plant.

→ Cut the stem horizontally near the base.

→ Drops of solution ooze out of the cut stem. This is due to the positive root pressure.

→ At night and early morning evaporation is low.

→ Literally, as we know excess of water collects in the form of droplets around special openings of veins in the grass blades and leaves.

→ Such water loss in liquid phase is called guttation.

→ Root pressure can only provide a modest push in the water transport.

→ They have no a major role in water movement up tall trees.

→ Root pressure re-establishes the continuous chains of water molecules in the xylem which often break under the tensions created by transpiration.

→ In most plants, majority of water transport occurs by transpiration pull.