The opening and closing of stomata are controlled by the guard cells. When water flows into the guard cells, they swell up and the curved surface causes the stomata to open. When the guard cells lose water, they shrink and become flaccid and straight thus closing the stomata.
What factors affect guard cells?
Factors Affecting Opening and Closing of Stomata: 4 Factors
- Light: Among external factors, light plays predominant role in the movement of guard cells. …
- Water Content of Epidermal Cells: ADVERTISEMENTS: …
- Temperature: Increase in the temperature causes stomata to open. …
- Mineral Elements:
What do guard cells act to regulate?
guard cell-regulation of transpiration. mesophyll-photosynthesis.
What will happen to the guard cells and stomatal pore when water?
Answer:Guard cells regulate the opening and closing of stomata and hence controls transpiration. When water flows into guard cells, they become turgid and the stomatal pore opens and in the unavailability of water they shrink hence closing the pore and avoiding transpiration.
What factors regulate the opening and closing of stomata?
The four factors affecting opening and closing of stomata are: (1) Light (2) Water Content of Epidermal Cells (3) Temperature and (4) Mineral Elements. Even during the day, guard cells may close stomata if a plant is losing water too quickly.
What controls the size of the stomata?
Most plants regulate the size of stomata with guard cells. Each stoma is surrounded by a pair of sausage-shaped guard cells. In bright light the guard cells take in water by osmosis and become plump and turgid . In low light the guard cells lose water and become flaccid , causing the stomata to close.
What are the two factors that control stomatal opening?
Light intensity and rate of loss of water (transpiration) are two factors that control the opening of stomata.
Which cell is called guard cell and why?
Explanation: Guard cells are cells surrounding each stoma. They help to regulate the rate of transpiration by opening and closing the stomata. … … This turgidity is caused by the accumulation of K+ (potassium ions) in the guard cells.
What is the function of guard cells in leaves?
Guard cells optimise leaf gas exchange in response to changing environmental conditions and their turgor is controlled by alterations in atmospheric CO2 concentration, light intensity, humidity and the drought hormone abscisic acid.