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An Intiative by Sri Chaitanya
a
Ascent of sap in xylem
b
Opening and closing of stomata
c
Uptake of minerals ions
d
Translocation of sugars from source to sink
answer is B.
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Detailed Solution
Levitt explained the influx of K+ in the guard cells and their role in the stomatal movement. According to this theory, the stomatal opening and closing depends on the generation of a potassium ion gradient.