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Question
What is difference between boardered pits and simple pits in xylem fibres?
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Solution
Sl.No.Simple pitsBordered pits1.Simple pits occurs mainly in parenchymatousoccurs in scelerenchymatous cells only. cells and rarely in sclerenchymatous cellsparenchymaouts cells2.Found in medullary rays,extra−xylary fiblres,companionAbundantly found in vessels of angiospersm and in tracheids of some angiospermsand tracheids of gymnosperms and ferns3.Pit cavity remains in same diameter throughoutSize and shape of pit cavity varies4.Closing membrane of pit remain in sameClosing membrane of pit varies in their diameter throughoutdiameter during development5.Simple organization of pit membranepit membrane with complex organization6.Pit border absentPit border present,formed by the overarching of secondary cell wall7.Pit aperture absentPit border present,formed by the overarching of secondary cell wall8.Pits may be circular, oval,polygonalPit aperture present,formed due to presence of pit borders9.Simple pits occuring in the thin walls are shallowIn the case of thick secondary wall,the border divides where as in thick wall the pit cavity maythe cavity into two parts−the space between the closing have the form of a canal passing frommembrane and the pit apeture is called pit chamber, the lumen of the cell towards the closing orand the canal leading from pit chamber to the lumen of common pit membranethe cell is called pit canal.10.Pit membrane homogenousPit membrane homogenous or heterogenous. Homogenous in angiosperms and heterogenous in gymnosperms11.Tours is absentTours is present, torus is the thickening of pit membrane which act as valves12.Valve like opening and closing mechanism absentTours and margo together with pith aperture acts lik valves and which regulate the opening and closing of pits13.Plasmodesmatal connections are seen in pit membranePlasmodesmatal connections are absent in the pit membrane
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