Question:
Two cross - sections of stem and root appear simple, when viewed by naked eye. But under microscope, they can be differentiated by
Two cross - sections of stem and root appear simple, when viewed by naked eye. But under microscope, they can be differentiated by
Updated On: Jun 21, 2024
- exarch condition of root and stem
- endarch condition of stem and root
- endarch condition of root and exarch condition of stem
- endarch condition of stem and exarch condition of root
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The Correct Option is D
Solution and Explanation
The stem and root can be differentiated on the basis of their xylem condition in root the xylem is exarch, ie, protoxylem (first formed xylem is towards the outer side of the organ and in stem the xylem is endarch, i e, protoxylem is towards the centre of the organ.
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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.