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NTA Abhyas NEET2020BotanyTransport in PlantsPractice

Accumulation of which one of the following acids results in the closure of stomata.

Options

  1. AMalic acid
  2. BAspartic acid
  3. CPEP
  4. DOxaloacetic acid.

Correct answer

A. Malic acid

Step-by-step solution

According to K + - H + pump theory during the closure of stomata, ABA stops the energy dependant proton pump in guard cell, thus K + diffuses out of the cell and H + enters inside, which combines with malate ion to form malic acid. OP of guard cells decreases thus stomata close.

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