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What is the fate of primary xylem in a d...

What is the fate of primary xylem in a dicot root showing extensive secondary growth?
(A) It is retained in the centre
(B) It gets crushed
(C) May or may not get crushed
(D) It gets surrounded by primary phloem

A

It is retained in the centre

B

It gets crushed

C

May or may not get crushed

D

It gets surrounded by primary phloem

Text Solution

Verified by Experts

The correct Answer is:
A
It is retained in the centre of the axis
Primary xylem is present in middle part of the root. When secondary growth takes place in root primary phloem tissue is pushed outwards while primary xylem root remains inside.
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KUMAR PRAKASHAN-ANATOMY OF FLOWERING PLANTS-SECTION-E SOLUTION OF NCERT EXEMPLAR (Multiple Choice Questions)
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  2. Match the following columns :

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  3. Match the following columns :

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  4. Identify the tissue system from among the following. (A) Parenchyma ...

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  5. Cells of this tissue are living and show angular wall thickening. They...

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  6. Epiblema of roots is equivalent to (A) Pericycle (B) Endodermis ...

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  7. A conjoint and open vascular bundle will be observed in the transverse...

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  8. Interfascicualr cambium and cork cambium are formed due to

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  9. Phellogen and phellem respectively denote (A) Cork and cork cambium ...

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  10. In which of the following pairs of parts of a flowering plant is epide...

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  11. How many shoot apical meristems are likely to be present in a twig of ...

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  12. A piece of wood having no vessels (trachea) must be belong to (A) Te...

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  13. A plant tissue, when stained, showed the presence of hemicellulose and...

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  14. Fibres are likely to be absent in (A) Secondary phloem (B) Seconda...

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  15. When we peel the skin of a potato tuber, we remove (A) Periderm (B...

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  16. A vessel less piece of stem possessing prominent sieve tubes would bel...

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  17. Which one of the following cell types always divide by anticlinal cell...

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  18. What is the fate of primary xylem in a dicot root showing extensive se...

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