A) the cambium is more active on the inner side
B) the cambium is more active on the outer side
C) the cambium is equally active on both sides but the xylem is needed more
D) the cambium has no role to plays in this difference
Correct Answer: A
Solution :
During secondary growth the amount of secondary xylem produced is more than the secondary phloem because cambium is more active on inner side. Vascular cambium consists two type of cells; fusiform initial and ray initial. The later form radial system, while the fusiform cells form axial system of secondary vascular tissue, which divide by periclinal division to form component of vascular tissues. Now the active cambium ceil toward inner side undergo multi plicate division for increasing the diameter of vascular cambium.
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