Ectophloic siphonostele is found in:
- Adiantum and Cucurbitaceae
- Osmunda and Equisetum
- Marsilea and Botrychium
- Dicksonia and maiden hair fern
The Correct Option is B
Solution and Explanation
An ectophloic siphonostele is a specific type of siphonostele, which itself is a stele consisting of a central core of pith surrounded by concentric layers of xylem and phloem. In the case of an ectophloic siphonostele, there is a ring of xylem surrounding the pith, with a ring of phloem located outside the xylem. This type of stele is exemplified by plants like Osmunda and Equisetum. Therefore, Osmunda and Equisetum are examples of plants that possess an ectophloic siphonostele.
So, the correct option is (B): Osmunda and Equisetum
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Concepts Used:
The Tissue System
Epidermal Tissue System:
The epidermal tissue system forms the outer-most covering of the whole plant body and comprises epidermal cells, stomata, and the epidermal appendages – the trichomes and hairs. The epidermis is the outermost layer of the primary plant body. It is made up of elongated, compactly arranged cells, which form a continuous layer. The epidermis is usually single-layered.
Ground Tissue System:
All tissues except the epidermis and vascular bundles constitute the ground tissue. It consists of simple tissues such as parenchyma, collenchyma, and sclerenchyma. Parenchymatous cells are usually present in the cortex, pericycle, pith, and medullary rays, in the primary stems and roots. In leaves, the ground tissue consists of thin-walled chloroplast-containing cells and is called mesophyll.
Vascular Tissue System:
The vascular system consists of complex tissues, the phloem, and the xylem. The xylem and phloem together constitute vascular bundles. In dicotyledonous stems, cambium is present between phloem and xylem. Such vascular bundles because of the presence of cambium possess the ability to form secondary xylem and phloem tissues and hence are called open vascular bundles. In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as closed.
Read More: Plant Tissue