Question:
The girth or diameter of the stem increases due to the activity of the following
The girth or diameter of the stem increases due to the activity of the following
Updated On: Jul 29, 2022
- Apical meristems
- Intercalary meristerns
- Lateral meristems
- Parenchyma cells
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The Correct Option is C
Solution and Explanation
Apical, intercalary and lateral meristems are the primary meristems (which are derived directly from the meristems of embryo).Apical meristems are present at the tips of stem, root and their branches. They produce growth in length.Intercalary meristems are commonly found at the bases of leaves, above or below the nodes. They help in elongation of the organs. Lateral meristems occur on the sides and take part in increasing girth (or diameter) of the stem of the plant. Only one type of primary lateral meristem is found in plants i.e. intrafascicular cambium. It lies in vascularbundles of dicot and gymnosperm stems in between phloem and xylem.Parenchyma is a simple permanent living tissue which performs a number of functions such as storage, conduction, secretion etc.
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Concepts Used:
Stem - Nodes and Internodes
Underground Modification
In some plants, stems are modified to form underground structures that store food. Some examples of the underground stem are as follows:
Rhizome: They are non-green, fleshy structures that resemble roots in appearance. The presence of nodes and internodes distinguishes them from roots. When a rhizome grows horizontally, it is called Straggling Rhizome. This type of rhizome is seen in turmeric, ginger, etc. If a rhizome grows in an oblique direction, it is called RootStock Rhizome. This is found in bananas and alocasia.
Therefore it has nodes and internodes. Ginger is a stem and not a root because it has nodes and internodes. It is a rhizome, an underground modification of the stem.