Multiple choice

Which of the following theories gives the latest explanation for the closure of stomata?

  1. ABA theory

  2. Munch theory

  3. Starch glucose theory

  4. Active potassium transport theory

  5. -
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The opening of stomata occurs due to the influx of K+ ions into the guard cells. The source of K+ ions are the neighbouring subsidiary and epidermal cells. It increases the concentration from 50 mM to 300 mM in guard cells. The increase in K+ ion concentration increases the osmotic concentration of guard cells. It leads to stomatal opening. ATP helps in entry of K+ ions into the guard cells.

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