Vascular cambium is a meristematic layer that cuts of
Primary xylem and primary phloem
Xylem vessels and xylem tracheids
Primary xylem and secondary xylem
Secondary xylem and secondary phloem
A
Primary xylem and secondary xylem
B
Xylem vessels and xylem tracheids
C
Primary xylem and primary phloem
D
Secondary xylem and secondary phloem
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Solution
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Inter and intrafascicular cambiums join to form a complete ring of cambium called as vascular cambium, which initiates intrastellar secondary growth. The vascular cambial cells are the meristematic cells that continuously divide into daughter cells. The daughter cells produced inward towards pith mature into secondary xylem elements, while those produced outward toward cortex differentiate into secondary phloem elements.
Thus, the correct answer is option D.
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Q1
Assertion :Secondary growth usually occurs in dicotyledonous stems Reason: The vascular cambium present between xylem and phloem possesses the ability to form secondary xylem and secondary phloem respectively
Assertion :The secondary phloem constitutes a less prominent part of the tree trunk than the secondary xylem. Reason: The amount of phloem produced by the vascular cambium is smaller than that of secondary xylem.