Answer:
Answer The immediate cause of the opening or closing
of the Stomata is a change in the turgidity of the guard cells. The inner wall
of each guard cell, towards the pore or stomatal aperture, is thick and
elastic. When turgidity increases within the two guard cells flanking each
stomatal aperture or pore, the thin outer walls bulge out and force the inner
walls into a crescent shape. The opening of the stoma is also aided due to the
orientation of the microfibrils in the cell walls of the guard cells. Cellulose
microfibrils are oriented radially rather than longitudinally making it easier
for the stoma to open. When the guard cells lose turgor, due to water loss (or
water stress) the elastic inner walls regain their original shape, the guard
cells become flaccid and the stoma closes.
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