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Some vascular bundles are described as open because these
A
Possess conjunctive tissue between xylem and phloem
B
Are not surrounded by pericycle
C
Are surrounded by pericycle but no endodermis
D
Are capable of producing secondary xylem and phloem
Detailed Solution
In dicot stems, a strip of cambium (intrafascicular cambium) is present between the xylem and the phloem of each vascular bundle.
Because of this cambium the bundle can form secondary xylem and secondary phloem; such vascular bundles are called open vascular bundles.
In monocots the vascular bundles have no cambium and cannot form secondary tissues; they are called closed.
Conjunctive tissue is the parenchyma between xylem and phloem patches in roots, and the terms open/closed have nothing to do with the pericycle or endodermis.
Hence open vascular bundles are those capable of producing secondary xylem and phloem.
Because of this cambium the bundle can form secondary xylem and secondary phloem; such vascular bundles are called open vascular bundles.
In monocots the vascular bundles have no cambium and cannot form secondary tissues; they are called closed.
Conjunctive tissue is the parenchyma between xylem and phloem patches in roots, and the terms open/closed have nothing to do with the pericycle or endodermis.
Hence open vascular bundles are those capable of producing secondary xylem and phloem.