explain the mechanism of closing and opening stomata
Answers
Explanation:
The opening of stomata: Solutes from neighbouring epidermal and mesophyll cells enter the guard cells lowering its osmotic potential and water potential. ... The closing of stomata: As the stomata open the solute concentration is reduced. This makes the water from the guard cells to move away into neighbouring cells.
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NCERT based Answer for Class 11 Biology Students
Opening and Closing of Stomata:
The immediate cause of opening and closing of stomata is a change in turgidity of guard cells.
The inner wall each guard cell (towards stomatal aperture) is thick and elastic.
Opening of stomata is also aided by orientation of microfibrils in cell walls of guard cells. Cellulose microfibrils are oriented radially rather than longitudinally.
Turgidity in guard cells is regulated by accumulation of solutes (K+, Cl-, and malate) in guard cells.
Solutes are taken in by guard cells from neighboring epidermal and mesophyll cells.
As a result, water potential of guard cells is lowered.
This creates water potential gradient between guard cells and neighboring cells. The gradient makes water move into the guard cells.
Guard cells become turgid resulting in stomatal opening.
With a decline in guard cell solutes, water moves out of guard cells, making them flaccid. As a result, stomata close.
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