Question

Vascular bundles in dicot stem are
A. Open, collateral, endarch
B. Closed, collateral, endarch
C. Open, collateral, exarch
D. Closed, collateral, exarch

Answer 1

Hint:-Cambium is present in vascular bundles of dicot stem. More than one strand of primarily xylem is present in the dicot system. Development of xylem and phloem are present on the same radius or collateral. Vascular bundles are scattered throughout the plant interior. Xylem arranged in search. Phloem is present on the outer side of phloem in the dicot system. Cells of procambian are not differentiated.

Complete answer:
Vascular tissue in plant stem and root are arranged in a particular manner. Strands of xylem and phloem arranged longitudinally and sometimes in cambium form vascular bundles or channels of vascular tissues in the rhizomes, stem and leaf veins of vascular plants. Arrangement of vascular tissues varies with the type of plant. Vascular bundles can be called as fascicles.
The dicot stem strip of cambium is found in between phloem and xylem; they are not in direct contact. Formation of secondary phloem and secondary xylem occurs in between.
Gymnosperms stems and dicot stems have open vascular bundles. In dicot stem, xylem and phloem arranged in the same radius or linear manner that’s why these are called as collateral.
In dicot stems protoxylem is directed towards the center Meta xylem elements towards the periphery known as endarch.
 So, the correct answer is option (A)

Note:-
In monocot stem, vascular bundles are closed to each other that mean phloem and xylem occur in direct contact with each other and intra – fascicular cambium is absent. Closed vascular bundles appear as collateral and arranged as endarch. Open collateral exarch and closed collateral exarch arrangement of vascular bundles are not found in any part of the plant body.