The cells of the quiescent centre are characterized
A
Having dense cytoplasm and prominent nuclei.
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B
Having light cytoplasm and small nuclei.
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C
Dividing regularly to add to the corpus.
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D
Dividing regularly to add to tunica.
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Solution
The correct option is B Having light cytoplasm and small nuclei.
According to quiescent centre theory, root apical meristem is present as the tip of main root and has a biconvex quiescent centre in its centre which is characterized by presence of inactive cells with less number of cell organelles, light cytoplasm, small nuclei and low synthesis of DNA, RNA and protein caused by low frequency of cell division, mitosis. The corpus-tunica theory is applicable to shoot apex, while the quiescent centre is present in root apex. Thus, the correct answer is option B.