Question:
The pattern of arrangement of leaves on the stem is known as
The pattern of arrangement of leaves on the stem is known as
Updated On: Jun 14, 2022
- heterophylly
- phyllode
- phyllotaxy
- phylloclade
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The Correct Option is C
Solution and Explanation
The pattern of arrangement of leaves on stem is known as phyllotaxy. This arrangement of leaves can be alternate, single leaf arising at each node, e.g., gurhal, opposite, arising of leaves on different side of the axis with base at same level opposite decussate (Calotropis), opposite superposed (guava) and whorled heterophylly is presence of more than on type of leaves and is observed in hydrophytes, while phyllode and phylloclads are modified leaf and stem and can be observed in Acacia and Cocofoba, Opuntia and Euphorbia respectivly.
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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.