Given below are two statements:
Statement I: Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement II: Exarch condition is the most Common feature of the root system.
In the light of the above statements, choose the correct answer from the options given below:
Statement I: Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement II: Exarch condition is the most Common feature of the root system.
In the light of the above statements, choose the correct answer from the options given below:
Both Statement I and Statement II are false.
Statement I is correct but Statement II is false.
Statement I is incorrect but Statement II is true.
Both Statement I and Statement II are true.
The Correct Option is C
Solution and Explanation
In plants, the terms "endarch" and "exarch" are used to describe the arrangement of xylem elements in the stem. "Endarch" refers to the condition where the xylem elements develop towards the center of the stem, and "exarch" refers to the condition where the xylem elements develop towards the periphery of the stem. These terms are not used to describe the position of secondary xylem, but rather the arrangement of primary xylem.
Statement II is true, as the exarch condition is indeed more common in the root system, where the xylem elements develop outward from the center of the root.
Therefore, The correct option is (C): Both Statement I and Statement II are true.
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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
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