The annual rings of the trees are formed by ......... by the activity of .........
The annual rings of the trees are formed by ......... by the activity of .........
The correct option is B Secondary xylem, vascular cambium
Intrafascicular cambium is present between
xylem and phloem in dicot stem and roots. Pith rays, present between the edges
of intrafascicular cambium, divide to form a new cambium strip between the two
vascular bundles i.e., interfascicular cambium. Thus, inter and intrafascicular
cambium together forms a complete cambium ring, called the vascular cambium,
which forms secondary xylem on the inner side and secondary phloem on the outer
side.
Differential cambial activity during autumn
and spring season results in narrow and wide secondary xylem rings respectively,
which together forms the annual growth ring. Thus, the annual growth ring is
derived from vascular cambium, which is the present between xylem and phloem in the vascular bundle and that’s why also termed as inter-Stelar cambium.
Thus, the correct answer is B.
Intrafascicular cambium is present between xylem and phloem in dicot stem and roots. Pith rays, present between the edges of intrafascicular cambium, divide to form a new cambium strip between the two vascular bundles i.e., interfascicular cambium. Thus, inter and intrafascicular cambium together forms a complete cambium ring, called the vascular cambium, which forms secondary xylem on the inner side and secondary phloem on the outer side.
Differential cambial activity during autumn and spring season results in narrow and wide secondary xylem rings respectively, which together forms the annual growth ring. Thus, the annual growth ring is derived from vascular cambium, which is the present between xylem and phloem in the vascular bundle and that’s why also termed as inter-Stelar cambium.
Thus, the correct answer is B.
