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Guard cells are the two curved cells on either side of the pore (hole). By changing their shape they can open or close the pore.
When the guard cells absorb water they bend outwards, so that the pore between them opens up. When they lose water they go back to a less curved shape, closing the pore between them.
Guard cells bend outwards when they absorb water because the wall next to the pore is thicker than the outer wall, so blah it stretches less.
Usually, stomata open in the day to let carbon dioxide into the leaf for photosynthesis and to let oxygen (made by photosynthesis) out of the leaf. They close at night, when photosynthesis cannot take place, to prevent the escape of water.
Improved answer-
Guard Cell
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∙ 11y ago
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∙ 12y agoThe guard cells are responsible for the protection of the stomata, and also for regulation due to the opening and closing to enhance the exchange of gases (CO2 & O2) in and out of the Dicot cell leave .........
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∙ 9y agoGuard cells surround the stomata and offer protective functions. They are responsible for the regulation of the rate of transpiration so as to avoid excessive water loss or retention.
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∙ 13y agoGaurd cells
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∙ 14y agoguard cells
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What cells guard the opening and closing of the stomata?
Stomatal pores in plants regulate the amount of water and solutes within them by opening and closing their guard cells using osmotic pressure. Guard cells and adjacent subsidiary cells are involved in opening and closing of stomata.
What is the role of a stomata and guard cells?
Through the stomata carbon dioxide diffuses into the plant and oxygen and water vapor diffuse out of the plant. Guard cells control the opening and closing of the stomata. Used in arid climates to control water loss for instance.
How the opening and closing of leaf stomata is controlled?
The stomata are controlled by two epidermal cells called guard cells. When water flows in, the guard cells swell up and closes the stomata. When the water leaves, it becomes flaccid and opens the stomata.
How does turgor pressure affects the opening and closing of stomata?
The stoma is "turgor operated valve". The opening and closing of stoma is regulated by the turgidity of guard cells. The stomata are open when the guard cells are turgid. On losing turgidity in guard cells, the stomata closes.
Stomata open and close in response to pressure within?
guard cells
How are the stomata controlled?
The stomata are controlled by two epidermal cells called guard cells. When water flows in, the guard cells swell up and closes the stomata. When the water leaves, it becomes flaccid and opens the stomata.
Which cells form the stomata?
Guard cells form the stomata.
What cells guard the opening and closing of the stomata?
Stomatal pores in plants regulate the amount of water and solutes within them by opening and closing their guard cells using osmotic pressure. Guard cells and adjacent subsidiary cells are involved in opening and closing of stomata.
What are pores surrounded by guard cells in the epidermis of a leaf?
Stomata are pores surrounded by the guard cells.
What is the role of a stomata and guard cells?
Through the stomata carbon dioxide diffuses into the plant and oxygen and water vapor diffuse out of the plant. Guard cells control the opening and closing of the stomata. Used in arid climates to control water loss for instance.
What is the relationship between guard cells and stomata?
Guard cells are cells on the edges of the stomata of a leaf. The stomata are very small pores that control water loss and keep the plant from drying out. When Abscisic Acid (ABA) - a stress hormone - is present, the Potassium ions (K+ ions) from the guard cells leave the guard cells for an unknown reason. This causes the stomata to close. Basically, guard cells assist stomata in opening/closing
Are guard cells part of the stomata or does stomata only refer to the pore on the lower surface of the leaf?
The stomata are the pores and the guard cells control the opening and closing of these pores.
What cells monitor the size of stomata?
The guard cells.
What regulates the stomata?
The guard cells open and close the stomata as needed.
What are the cells that surround the stomata called?
Guard Cells surround the stomata, and enable it to open or shut.
How the opening and closing of leaf stomata is controlled?
The stomata are controlled by two epidermal cells called guard cells. When water flows in, the guard cells swell up and closes the stomata. When the water leaves, it becomes flaccid and opens the stomata.
How does turgor pressure affects the opening and closing of stomata?
The stoma is "turgor operated valve". The opening and closing of stoma is regulated by the turgidity of guard cells. The stomata are open when the guard cells are turgid. On losing turgidity in guard cells, the stomata closes.
