Question

Question 16 What causes the opening and closing of guard cells of stomata during transpiration?

Class XI Biology Chapter - Transport in Plants Page 193

Answer 1

The tiny pores present on the surfaces of leaves, called stomata, help in the exchange of gases. Each stoma consists of bean-shaped or dum. bells shaped guard cells. The epidermal cells surrounding the guard cells are modified to form subsidiary cells. The opening and closing of the guard cells is caused by a change in their turgidity. The inner walls of the guard cells are thick and elastic, while the outer walls are thin. The numerous micro fibrils present in the guard cells facilitate the opening and closing of the guard cells.

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Answer 2

Explanation:During transpiration the movement of potassium ions in and out of the guard cells causes the opening and closing of stomata. ... Due to this the water potential in the guard cells decreases and water moves inside the guard cells causing them to swell up and become turgid which in turn causes the opening of stomata pores.