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The cells of the quiescent centre are characterised by : -
A
Having dense cytoplasm and prominent nuclei
B
Having light cytoplasm and small nuclei
C
Dividing regularly to add to the corpus
D
Dividing regularly to add to tunica
Detailed Solution
The quiescent centre is a group of cells in the centre of the root apical meristem, described by F. A. L. Clowes.
Its cells divide very slowly or not at all (they are relatively inactive, as the name 'quiescent' suggests). They act as a reserve that can replace damaged meristem cells.
Being metabolically inactive, they have light (less dense) cytoplasm, small nuclei and few organelles, with low DNA, RNA and protein synthesis.
Tunica and corpus are layers of the shoot apex, not of the root.
So cells of the quiescent centre are characterised by light cytoplasm and small nuclei.
Its cells divide very slowly or not at all (they are relatively inactive, as the name 'quiescent' suggests). They act as a reserve that can replace damaged meristem cells.
Being metabolically inactive, they have light (less dense) cytoplasm, small nuclei and few organelles, with low DNA, RNA and protein synthesis.
Tunica and corpus are layers of the shoot apex, not of the root.
So cells of the quiescent centre are characterised by light cytoplasm and small nuclei.