Formation of secondary xylem and phloem respectively
Formation of secondary xylem and phloem respectively
The correct option is B Centripetal and centrifugal
Vascular
cambium exhibits two patterns of division; multiplicative divisions or additive
divisions, thus, cut more actively at the centre. Multiplicative divisions
increase the circumference of the vascular cambium. Additive division adds
phloem or xylem mother cell that differentiates into their respective cell
types.
The
primary xylem is in the centre of the stem and thus, secondary xylem is formed
towards the inner side, while the primary phloem is pushed outward by the new cells
that arise from the vascular cambium, i.e., produced towards the outer side.
Growth pattern that moves towards the centre is called centripetal while those
moving outwards away from the centre is called as centrifugal.
Xylem
shows centripetal growth while phloem exhibits centrifugal growth pattern.
Thus,
the correct answer is option B.
Vascular cambium exhibits two patterns of division; multiplicative divisions or additive divisions, thus, cut more actively at the centre. Multiplicative divisions increase the circumference of the vascular cambium. Additive division adds phloem or xylem mother cell that differentiates into their respective cell types.
The primary xylem is in the centre of the stem and thus, secondary xylem is formed towards the inner side, while the primary phloem is pushed outward by the new cells that arise from the vascular cambium, i.e., produced towards the outer side. Growth pattern that moves towards the centre is called centripetal while those moving outwards away from the centre is called as centrifugal.
Xylem shows centripetal growth while phloem exhibits centrifugal growth pattern.
Thus, the correct answer is option B.
