Mineral Transport in Plants · NCERT Biology

The concept that xylem only transports water/minerals and phloem only transports organics is no longer strictly accurate because:

  1. Xylem can also transport sugars to roots during summer dormancy.
  2. Small amounts of material are exchanged between xylem and phloem.
  3. Phloem is the primary transporter of nitrogenous ions in all seasons.
  4. Xylem is composed entirely of metabolically active living cells.
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Correct answer: Small amounts of material are exchanged between xylem and phloem.

Chemical analysis reveals that there is an exchange of materials between xylem and phloem. Both organic and inorganic solutes can be found in both tissues, though they have primary roles.

Difficulty: Medium Question 12 of 20

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