Question:
Stomatal aperture is surrounded by guard cells and widens (opens) when guard cells are _____________.
Stomatal aperture is surrounded by guard cells and widens (opens) when guard cells are _____________.
Updated On: Jul 12, 2024
- (A) flaccid
- (B) turgid
- (C) bean shaped
- (D) dumb-bell shaped
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Explanation:
Stomatal aperture is surrounded by guard cells and widens (opens) when guard cells are turgid. The kidney-shaped cells surrounding each stoma are guard cells. They regulate the rate of transpiration by opening and closing the stomata. When the guard cells are turgid, or swollen, the stomatal opening is widened. This turgidity is due to accumulation of K+ ions. Potassium ions move into the vacuoles. The water moves into the vacuoles, following potassium ions. As a result, the guard cells expand and the stoma opens.Hence the correct option is (B).
Stomatal aperture is surrounded by guard cells and widens (opens) when guard cells are turgid. The kidney-shaped cells surrounding each stoma are guard cells. They regulate the rate of transpiration by opening and closing the stomata. When the guard cells are turgid, or swollen, the stomatal opening is widened. This turgidity is due to accumulation of K+ ions. Potassium ions move into the vacuoles. The water moves into the vacuoles, following potassium ions. As a result, the guard cells expand and the stoma opens.Hence the correct option is (B).
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