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Question
Which one of the following histogens is present in the roots but not in the shoots?
Which one of the following histogens is present in the roots but not in the shoots?
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Solution
The correct option is B Calyptrogen
According to histogen theory, as proposed by Hanstein, the root and shoot apices have three distinct meristematic regions called as histogens, these are namely dermatogens, periblem and plerome. The dermatogens makes uniseriate epidermis by anticlinal divisions, periblem forms cortex and plerome serve as progenitor of stele (pericycle, vascular bundles, pith rays or medullary rays and pith). Monocotyledons have four histogens; calyptrogen being the fourth one that makes root cap.Calyptrogen is a type of histogen present in monocot roots,It is found absent in shoots.
Hence, the correct answer is (A)
According to histogen theory, as proposed by Hanstein, the root and shoot apices have three distinct meristematic regions called as histogens, these are namely dermatogens, periblem and plerome. The dermatogens makes uniseriate epidermis by anticlinal divisions, periblem forms cortex and plerome serve as progenitor of stele (pericycle, vascular bundles, pith rays or medullary rays and pith). Monocotyledons have four histogens; calyptrogen being the fourth one that makes root cap.Calyptrogen is a type of histogen present in monocot roots,It is found absent in shoots. Hence, the correct answer is (A)
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