Question
Download Solution PDFAn interruption in the vascular tissues of the stem of some ferns is called a leaf gap. Due to overlapping of the leaf gaps, the vascular tissues of the stem appear as scattered. This type of steie is called
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is dictyostele
Concept:
- In the vascular tissues of some ferns, an interruption known as a leaf gap occurs. Leaf gaps are spaces where the vascular tissue is absent due to the origin of a leaf trace.
- Due to the overlapping of these leaf gaps, the vascular tissues of the stem appear scattered.
- This arrangement of vascular tissues, resulting from the overlapping leaf gaps, is known as a dictyostele.
Explanation:
- Actinostele: This type of stele has a star-shaped vascular cylinder. It is found in some primitive plants but does not involve overlapping leaf gaps.
- Plectostele: This is a type of stele where the vascular tissue is divided into discrete sections by parenchyma. It does not feature the overlapping leaf gaps characteristic of a dictyostele.
- Dictyostele: In this type of stele, the vascular tissue forms a network due to the presence of numerous leaf gaps that overlap. This gives the appearance of scattered vascular bundles in the stem. It is characteristic of many ferns.
- Haplostele: This type of stele is the simplest form, consisting of a solid core of xylem surrounded by phloem. It does not have leaf gaps
Fig: Types of stele
Last updated on Jun 18, 2025
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