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Question

Difficulty: EasyPlant Science and Agricultural Technology

Which plant hormone is primarily synthesized in response to water stress to induce stomatal closure and minimize transpiration loss?

  1. Abscisic acidAnswer
  2. B
    Gibberellic acid
  3. C
    Auxin
  4. D
    Cytokinin

Answer

Abscisic acid is the primary plant hormone responsible for inducing stomatal closure during water stress conditions.
Abscisic acid serves as a plant stress signaling hormone. When plants experience drought, roots and leaves synthesize abscisic acid, which travels to leaf guard cells and prompts them to close stomata, thereby conserving water.

Step-by-Step Solution

1
Identify the stress condition described in the stem
Water stress (drought) causing excessive moisture loss through transpiration.
Plants need a rapid hormonal signal to conserve water when soil moisture decreases.
2
Determine the specific plant growth regulator involved
Abscisic acid acts as the principal stress hormone.
Increased levels of abscisic acid trigger an efflux of potassium ions from guard cells, leading to water loss from guard cells and closure of the stomatal pore.

Key Concept

Plant Hormones and Stress Physiology
Estimated Time:45s
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Topics

Plant Science and Agricultural Technology

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