ANIMAL PHYSIOLOGY
OSMOREGULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The efflux of potassium ions from the guard cell
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The increase in the concentration of glucose in the guard cell
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The increase in the concentration of carbon dioxide in the guard cells.
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The increase in the concentration of the abscisic acid when plants are exposed to stress.
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Detailed explanation-1: -The protons are pumped out of the guard cells, and in exchange K+ ions are pumped in. Thus, the pH is raised and the potassium ions lower the osmotic potential, which results in endosmosis. This makes the guard cells turgid resulting in the opening of the stoma.
Detailed explanation-2: -Guard cells are a pair of two cells that surround each stoma opening. To open, the cells are triggered by one of many possible environmental or chemical signals. These can include strong sunlight or higher than average levels of carbon dioxide inside the cell.
Detailed explanation-3: -Stomatal pores open when guard cells enlarge as a result of water absorption and close when guard cells shrink. The opening and closing of stomata will also depend on factors such as light, temperature, carbon dioxide, and humidity.
Detailed explanation-4: -Upon the incoming of water inside the guard cells, they swell up to become like a curved banana surface, due to which the stomatal pore opens up. When the guard cells lose water, they become flaccid and straight and thus, close the stomatal aperture. Guard cells and stomata regulates the respiration process in plants.
Detailed explanation-5: -Opening and closing of stomata take place due to turgor pressure that changes in guard cells. As the solute particles enter the guard cells from the epidermal and mesophyll cells, both the osmotic potential and the water potential of the guard cells get lowered.