LABORATORY REVIEW
TRANSPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Stomata take up K+ into their guard cells, which attracts water to enforce their opening.
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Stomata export K+ from their guard cells, which causes water to diffuse out, and that is the trigger for stomata to open up.
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Na+ is the main ion source to control stomata opening in plants.
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Most critical is the closing of aquaporins in the cell wall of guard cells to open up stomata.
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Stomata have small muscles that contract and open up the kidney shaped guard cells.
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Detailed explanation-1: -Stomatal opening is accompanied by lowered osmotic pressure in guard cell i.e., declining of solute in guard cells, the rise in potassium concentration and movement of water inside the guard cells, which makes them turgid. Thus, the correct answer is option B.
Detailed explanation-2: -(iii) stomata opens when guard cells are flaccid.
Detailed explanation-3: -Answer and Explanation: This is the correct answer C) Stomata are important in terrestrial plants because they allow CO2 to diffuse into the plant.
Detailed explanation-4: -Their main function is to allow gases into and out of the leaf.
Detailed explanation-5: -The opening and closing of stomata is regulated by the inflow and outflow of water from the guard cells. Answer: The opening of guard cells is facilitated by the entry of water. This makes the guard cell become turgid.