Question:
In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order:
In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order:
Updated On: Jul 12, 2022
- root cap, cell division, cell enlargement, cell maturation
- root cap, cell division, cell maturation, cell enlargement
- cell division, cell enlargement, cell maturation, root cap
- cell division, cell maturation, cell enlargement, root cap.
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The Correct Option is A
Solution and Explanation
The root system of a plant develops from the hypocotyl of the embryo of a seed. The root shows following four regions these usually merge into one another, without distinct boundaries between them. Region of Cell Maturation Region of Cell Elongation Region of Cell Division Regions of the root The zones, successively from the apex to the base are- (i) Root cap zone : The apex of each root is covered by a cushion of thin walled cells known as root cap. (ii) Region of cell division : It lies just behind the root cap. It is the main growing region of the root where active cell divisions take place. (iii) Region of elongation : The region of elongation is responsible for growth in length of the root. (iv) Region of maturation : Epidermal cells of this region give out small, thin, cylindrical unicellular outgrowths, known as root hairs. These are the main absorbing organs of the root
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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.