Multiple choice

Which of the following statements is true for primary xylem in a dicot root showing extensive secondary growth?

  1. It is retained in the centre of the axis.

  2. It gets crushed.

  3. It gets surrounded by primary phloem.

  4. None of these
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A Correct answer
Explanation

During extensive secondary growth in dicot roots, the primary xylem remains in the center of the axis and is NOT crushed. Secondary vascular tissues are formed around it, but the central primary xylem persists. This is distinct from primary phloem which gets crushed during secondary growth.

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