Guard cells are responsible for opening and closing of stomata. give reason
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Answer:
Guard cell are cells surrounding each stoma. They help to regulate the rate of transpiration by opening and closing the stomata. The guard cells have lost water, which cause the stomatal opening to close. This may occur when the plant has lost an excessive amount of water.
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Opening and closing of stomata takes place due to changes in turgor of guard cell. The turgor changes in the guard cells are due to entry and exit of water into and out of the guard cells. During the day, water from the subsidiary cells enter the guard cells making it fully turgid causing the stomata to open. During night time, water from guard cells enters the subsidiary cells makes the guard cells flaccid causing the stomata closes.
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