FORESTRY
PLANT AND WOOD ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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PROTOXYLEM IS PRESENT TOWARDS PITH AND METAXYLEM TOWARDS PERIPHERY
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METAXYLEM IS PRESENT TOWARDS PITH AND PROTOXYLEM TOWARDS PERIPHERY
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BOTH 1 AND 2
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NEITHER OF THESE
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Detailed explanation-1: -Endarch xylem: Protoxylem is directed toward the centre while metaxylem is directed toward the periphery in an endarch configuration. In this exarch arrangement, the xylem develops according to the centripetal pattern. In an endarch configuration, xylem growth follows a centrifugal pattern.
Detailed explanation-2: -There are three types of arrangement of primary xylem, namely endarch, exarch and mesarch. In endarch the protoxylem lies towards the centre and metaxylem towards the periphery, in exarch protoxylem lies towards the periphery and metaxylem towards the centre and in mesarch protoxylem is surrounded by metaxylem.
Detailed explanation-3: -Protoxylem is the initially formed Xylem that develops before the plant organ is completely grown and Metaxylem is formed later. Under endarch condition in the plant stem, protoxylem lies at the center and metaxylem at the end of the organ.
Detailed explanation-4: -Exarch condition of xylem is found in roots, whereas endarch condition occurs in stems.