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A stoma is simply the space between two cells called guard cells.

The guard cells are specialized cells of the leaf's epidermis. The guard cells have unevenly thickened walls. When their vacuoles contain the maximum amount of water, turgor causes the cells to bend, leaving a space, the stoma, between them.

When the osmotic pressure falls, the cells partially collapse, like partly-deflated balloons, closing the stoma.

The variations in turgor in guard cells are brought about by varying concentrations of potassium ions in the cells.

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15y ago
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14y ago

The guard cells control the size of the stomatal pore by changing their shape. The change in shape is caused by water either entering the guard cells(to open the stomata) or leaving the guard cells (to close the stomata). Yes, the guard cells do control the amount of water loss through transpiration.

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16y ago

The guard cells control the opening and closing of the stomata.

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15y ago

by inflating or deflating them selfs with water

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9y ago

Plants loses their water in way of evaporation from the stomata of its leaves. The opening of stomata is controlled by guard cells.

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14y ago

A type of paired epidermal cells in plant leaves called guard cells control the opening and closing of the stomata by absorbing water to swell itself.

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14y ago

Guard cells

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Q: What cells regulate the amount of water vapor that passes through the stoma?
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