The opening and closing of the stomatal pore depends upon

(a) Concentration of oxygen in the atmosphere.
(b) Temperature of the atmosphere.
(c) Presence of water in guard cells.
(d) Concentration of ${CO}_{2}$ in stomata

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Solution

(c) Presence of water in guard cells.

The opening and closing of the pore is a function of the guard cells. The guard cells swell when water flows into them, causing the stomatal pore to open. Similarly, the pore closes if the guard cells shrink when water flows out from the guard cells.

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Question 29
The opening and closing of the stomatal pore depends upon

(a) Oxygen
(b) Temperature
(c) Water in the guard cells
(d) Concentration of ${CO}_{2}$ in stomata

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. The opening and closing of the stomatal pore depends upon

Q. How do the guard cells regulate opening and closing of stomatal pores?

Q. Stomatal movements are influenced by a number of environmental factors. Which of the following statements is/are incorrect regarding this?
(i) Blue light keeps stomata open during the day promoting the movement of

K^{+}

ions into guard cells.
(ii) Increased

C O_{2}

concentration reduces the pH of guard cells which promotes conversion of sugar into starch, ultimately causing closure of stomata.
(iii) Abscisic acid, under stress conditions, causes rapid movement of

K^{+}

ions into guard cells.
(iv) Highly concentrated sucrose or salt solution when applied over to stomata, results in stomatal opening.

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The opening and closing of the stomatal pore depends upon (a) Concentration of oxygen in the atmosphere. (b) Temperature of the atmosphere. (c) Presence of water in guard cells. (d) Concentration of CO2 in stomata

(c) Presence of water in guard cells. The opening and closing of the pore is a function of the guard cells. The guard cells swell when water flows into them, causing the stomatal pore to open. Similarly, the pore closes if the guard cells shrink when water flows out from the guard cells.

The opening and closing of the stomatal pore depends upon

(a) Concentration of oxygen in the atmosphere.
(b) Temperature of the atmosphere.
(c) Presence of water in guard cells.
(d) Concentration of ${CO}_{2}$ in stomata

(c) Presence of water in guard cells.

The opening and closing of the pore is a function of the guard cells. The guard cells swell when water flows into them, causing the stomatal pore to open. Similarly, the pore closes if the guard cells shrink when water flows out from the guard cells.