Stomatal aperture is surrounded by guard cells and widens (opens) when guard cells are

Flaccid

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Turgid

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Bean shaped

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Dumb - bell shaped

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Solution

The correct option is B 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 large/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/widens.
Thus, the correct answer is option (B).

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Similar questions

The stomatal aperture which is surrounded by guard cells opens when these cells are ___

Q. Given below is the diagram of a stomatal apparatus. In which of the following, all the four parts labelled as A, B, C and D are correctly identified?

	A	B	C	D
1.	Epidermal cell	Subsidiary cell	Stomatal aperture	Guard cell
2.	Subsidiary cell	Epidermal cell	Guard cell	Stomatal aperture
3.	Guard cell	Stomatal aperture	Subsidiary cell	Epidermal cell
4.	Epidermal cell	Guard cell	Stomatal aperture	Subsidiary cell

The stomatal pore is guarded by two kidney shaped guard cells. Name the epidermal cells surrounding the guard cells. How does a guard cell differ from an epidermal cell? Use a diagram to illustrate your answer.

Q. Assertion: Opening and closing of stomata is controlled by guard cells.
Reason: Shrinking of guard cells results in the opening of stomatal pore.

Q. Which of the following statement is correct regarding opening and closing of stomata?
(i) stomata opens when guard cells are turgid.
(ii) stomata closes when guard cells are turgid.
(iii) stomata opens when guard cells are flaccid.
(iv) stomata closes when guard cells are flaccid.

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