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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Botany
Chapter
Transport in Plants

NTA Abhyas 2020 · Botany · Transport in Plants

Which ion helps in opening and closing of stomata?

Which ion helps in opening and closing of stomata?

Options

  1. AMn+Mn^{+}
  2. BMg2+M{g^{2}}^{+}
  3. CCa2+C{a^{2}}^{+}
  4. DK+K^{+}

Correct answer

D. K+K^{+}

Step-by-step solution

According to active K+K^{+} theory of Levitt, opening of stomata occurs due to influx of K+K^{+} into guard cells. The source of K+K^{+} ions are nearby subsidiary and epidermal cells. The stomatal closure is considered to be brought about by exertion of K+andCl−K^{+}andCl^{-} from the guard cells to epidermal tissue.
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