Mineral Transport in Plants · NCERT Biology

The movement of ions into the 'free space' or 'outer space' of the cell without the expenditure of metabolic energy is known as:

  1. Rapid water loss by transpiration pulling the xylem sap
  2. Active secretion of water molecules into the xylem
  3. Active ion uptake into vascular tissues drawing water by osmosis
  4. Passive diffusion of sugar from phloem into the xylem
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Correct answer: Active ion uptake into vascular tissues drawing water by osmosis

As various ions from the soil are actively transported into the vascular tissues of the roots, water follows (its potential gradient) and increases the pressure inside the xylem. This positive pressure is called root pressure.

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