SCIENCE
PLANT KINGDOM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Adiantum and Cucurbitaceae
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Osmunda and Equisetum
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Marsilea and Botrychium
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Dicksonia and maiden hair fern
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Detailed explanation-1: -Ectophloic siphonostele is a monostele type of siphonostele in which a ring of xylem occurs around the pith, and a ring of phloem outside the xylem. It is found in Osmunda and Equisetum.
Detailed explanation-2: -1. Ectophloic siphonostele: In this type, the central pith is surrounded successively by xylem, phloem, pericycle, and endodermis. It is found in Osmunda and Equisetum.
Detailed explanation-3: -Solenostele(non-overlapping leaf gaps)-This type of stele is primarily found in fern stems today. dictyostele (overlapping leaf gaps)-Among living plants, this type of stele is found only in the stems of ferns. Thus the correct answer is option “A” i.e., Osmunda and Equisetum.
Detailed explanation-4: -It is commonly found in Equisetum and Osmunda. Ectophloic siphonostele: In this type of siphonostele in which the pericycle, xylem, phloem, and endodermis all surround the central pith.
Detailed explanation-5: -ferns. … common in fern stems are siphonosteles, having a pith in the centre with the vascular tissue forming a cylinder around it. Where a fern leaf is attached to a stem, a part of the vascular tissue of the stem goes into it (a leaf trace), making a slight gap, filled…