Which mechanism reduces xylem water transport when soil dries at roots?

💡 Explanation

Drying soil triggers abscisic acid production, initiating stomatal closure. This response minimizes transpiration, reducing tension and water movement through the xylem, because the abscisic acid disrupts the cohesion-tension mechanism. Therefore the plant conserves water, rather than risking cavitation from excessive tension.

• Which outcome is observed when a fish's gill filaments are damaged, reducing surface area for countercurrent exchange?
• Which risk increases for soaring birds during heavy molting resulting in primary feather loss?
• Which phenomenon results when legume nodule enzymes denature?
• Which heat-generation mechanism is stimulated by thyroid hormones that increases metabolic rate in skeletal muscle?
• Which outcome occurs when daytime arid temperatures limit C4 plants?
• Which outcome occurs when comb jellies experience mechanical disturbance?