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प्रश्न
What is the fate of primary xylem in a dicot root showing extensive secondary growth?
विकल्प
It is retained in the centre of the axis.
It gets crushed.
May or may not get crushed.
It gets surrounded by primary phloem.
MCQ
उत्तर
It is retained in the centre of the axis.
Explanation:
The cambial ring becomes active and starts cutting off new cells from both the inner and outer sides. The cells that are cut off near the pith and mature into secondary phloem are gradually squashed as secondary xylem continues to form and accumulate. The primary xylem, on the other hand, stays mostly intact at or near the centre.
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Secondary Growth - Secondary Growth in Roots
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