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Question
Root apex has a zone of slow dividing cells in the middle of rapidly dividing cells. It is
Root apex has a zone of slow dividing cells in the middle of rapidly dividing cells. It is
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Solution
The correct option is B Quiescent centre
The quiescent centre (QC) is a small group of cells with low mitotic activity (they divide sometimes, but only rarely). QC's are to be found at the tips of growing roots, in the root meristem, and are typically surrounded by groups of initial cells. Through rounds of cell division, these initial cells give rise to the various tissues of the root and so there are usually vascular initials, pericycle initials, cortex initials etc. It is thought that the QC sends out signals to these initial cells to ensure that they remain in an initial state and keep dividing to produce whatever tissue they are responsible for. So, root apex has a zone of slow dividing cells in the middle of rapidly dividing cells which is called as quiescent centre and not dormant centre or non-meristematic zone.
Thus, the correct answer is option A.
The quiescent centre (QC) is a small group of cells with low mitotic activity (they divide sometimes, but only rarely). QC's are to be found at the tips of growing roots, in the root meristem, and are typically surrounded by groups of initial cells. Through rounds of cell division, these initial cells give rise to the various tissues of the root and so there are usually vascular initials, pericycle initials, cortex initials etc. It is thought that the QC sends out signals to these initial cells to ensure that they remain in an initial state and keep dividing to produce whatever tissue they are responsible for. So, root apex has a zone of slow dividing cells in the middle of rapidly dividing cells which is called as quiescent centre and not dormant centre or non-meristematic zone.
Thus, the correct answer is option A.
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