Question

Conjoint, collateral, and closed vascular packets are set up in?
A. Monocot stem
B. Monocot root
C. Dicot stem
D. Dicot root

Answer 1

Hint: Vascular bundles constitute the transportation system of a plant. It is made up of strands of Xylem and Phloem vessels. Conjoint vascular bundle refers to the xylem and phloem arrangement bundled together in the same radius.

Complete step by step answer:
Before finding the correct answer from the given options, we need to analyse the options to find the best-suited answer.
A. The vascular bundles of a monocot stem are arranged in scattered arrangements. Each of them is collateral, conjoint and closed. The cortex region of the plant is surrounded by large parenchyma. Cambium is absent in them. Hence, this might not be our correct option.
B. The vascular bundles in a monocot root are arranged in a radial arrangement. Hence, this option doesn’t satisfy the conditions provided in the question.
C. The vascular bundles in the dicot root are also found in a radial arrangement. The xylem and phloem are arranged separately. Therefore, this is an incorrect option.
D. Dicot stems have vascular bundles that are arranged in a ring. They surround the central pith. Each of the vascular bundles in the dicot stem is collateral, conjoined, open, and endarch. Cambium is present between the xylem and phloem. Hence, this is the appropriate option.
Hence, the right answer to this question is option (D).

Note:
A. The phloem is always situated on the periphery (outer edges) of the xylem.
B. The vascular bundles of the dicot stem are uniform in size.
C. Medullary parenchyma is present on the sides of vascular bundles in a dicot stem.