NEET 2003 Biology question

Stomata of a plant open due to : -

(1)Influx of potassium ionsCorrect
(2)Efflux of potassium ions
(3)Influx of hydrogen ions
(4)Influx of calcium ions

Answer: (1)

Solution

In light, potassium ions are actively taken up (influx) into the guard cells, mainly in exchange for hydrogen ions pumped out. This lowers the water potential of the guard cells, so water enters by osmosis, they become turgid, and

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Question ID VK-089301