A) Na
B) K
C) ABA
D) Auxins
Correct Answer: B
Solution :
Most accepted theory for opening of stomata is \[{{K}^{+}}\] ion pump hypothesis, according to \[{{K}^{+}}\] ion pump hypothesis of Levitt. Stomatal opening in plants occurs due to influx of \[{{K}^{+}}\].Stomatal closing is controlled by ABA or abscisic acid. Auxins are plant hormones which causes apical dominance in plants. Na is non-essential for plant growth. It is helpful in nerve conduction in animals.
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