Question:
Cork cambium of dicot stem originates from
Cork cambium of dicot stem originates from
Updated On: Apr 18, 2024
- Dedifferentiated parenchyma cells of cortex
- Dedifferentiated collenchyma cells of cortex
- Parenchyma cells of medullary rays
- Parenchyma cells of pericycle
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The Correct Option is B
Solution and Explanation
The phellogen or cork cambium, is initiated by dedifferentiation of various types of cells. Depending on the position of cork cambium, the originating cells may be the epidermal cells, cortical collenchyma or parenchyma cells or pericycle cells (in case of root). Later on in subsequent growing seasons, cork cambium generally differentiates from phloem cells in both roots and 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.