Question:
Polyarch condition is found in
Polyarch condition is found in
Updated On: Jul 28, 2022
- monocot root
- dicotroot
- monocot stem
- dicotstem
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The Correct Option is A
Solution and Explanation
The vascular tissue in moncot root consists of six or more vascular bundles which are arranged in a ring just inner to the pericycle. The vascular bundles are radial i.e., xylem and phloem are situated at different radii. As the number of vascular bundle is more than six in monocots, the condition is known as polyarch. In dicot root the vascular bundles are 2 to 6 and this condition is called diarch to hexarch. In dicot stem the vascular bundles are conjoint, collateral and open and are arranged in a ring. In monocot stem the vascular bundles are conjoint, collateral, closed and are scattered.
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Concepts Used:
Anatomy of Dicotyledonous and Monocotyledonous Plants
Dicot Root:
- Dicot plants have the taproot system.
- The outermost layer is called the epidermis. The epidermal cells sometimes project out which appear as the root hairs.
- The epidermis is followed by the multi-layered cortex, loosely made of the parenchyma cells with intercellular spaces.
- The inner layer of the cortex is called endodermis, which is tightly packed by the barrel shaped-cells.
- Endodermis is followed by pericycle, which are a few layers of thick-walled parenchyma cells.
- In dicots, the central pith is not distinct.
- There are two to four xylem and phloem.
- The xylem and phloem are remarked by a layer of parenchymatous cells known as conjunctive tissue.
Monocot Root:
Monocot roots do not show much difference in the anatomy from that of the dicot roots.
- Monocot plants possess an adventitious root system.
- As in the dicots, the epidermis forms the outermost layer, followed by cortex, pericycle, endodermis, vascular bundles (xylem and phloem) and pith (random order).
- Pith is conspicuous and large.
- The number of xylem in a monocot is six or more.
- Secondary growth is not seen in the monocot plants.