Question:
If the ? mode of differentiation of xylem is centrifugal, then it is
If the ? mode of differentiation of xylem is centrifugal, then it is
Updated On: Jun 21, 2022
- exarch
- endarch
- mesarch
- centrarch.
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The Correct Option is B
Solution and Explanation
Primary xylem consists of protoxylem (first-formed xylem) and metaxylem (lateformed xylem). On the basis of order of differentiation of xylem element and position of proto and metaxylem, three different types of conditions are observed endarch, exarch and mesarch. In endarch condition, the differentiation of initial xylem begins near centre of stele and proceeds towards the periphery. Hence the protoxylern occurs towards the centre of the axis and metaxylem, towards the periphery of the axis. Such type of xylem is called endarch or centrifugal. This condition is seen in angiospermic stem.
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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.