Select the wrong statements.I. Primary and se | vedclass

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(D) During secondary growth in dicot stems,the vascular cambium becomes active and produces secondary xylem towards the inner side and secondary phloe

Vedclass · Accepted Answer

Both are correct.

Vedclass · Answer

(D) During secondary growth in dicot stems,the vascular cambium becomes active and produces secondary xylem towards the inner side and secondary phloem towards the outer side.As the secondary xylem accumulates,it exerts pressure on the primary xylem,which remains more or less intact in the center of the stem.Conversely,the primary phloem is pushed outward and eventually gets crushed due to the continuous formation and accumulation of secondary phloem and secondary xylem.Therefore,statement $I$ is correct because primary phloem is crushed,but secondary phloem is generally not crushed as it is newly formed. However,in the context of standard biology questions,statement $I$ is often considered correct regarding the crushing of primary phloem,and statement $II$ is correct regarding the primary xylem. Since both statements are factually correct,there is no 'wrong' statement among the choices provided.

Select the wrong statements.
$I.$ Primary and secondary phloem gets crushed during secondary growth.
$II.$ During secondary growth,primary xylem remains more or less intact.

Similar Questions

Which of the following increases rapidly as the age of a tree increases?

Cambium is essential for grafting in plants because

$A$: Complementary cells are cut-off by phellogen towards the outside.
$R$: Phellogen is partially secondary in origin.

In dicots and gymnosperms,secondary growth is caused by:

The age of a tree can be estimated by:

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Select the wrong statements.$I.$ Primary and secondary phloem gets crushed during secondary growth.$II.$ During secondary growth,primary xylem remains more or less intact.