Which risk increases for large trees during droughts because diminished xylem sap availability restricts the cohesion-tension mechanism?

💡 Explanation

Xylem conduits experience increased tension via transpiration during droughts. This causes air seeding which induces embolism by disrupting cohesion-tension mechanism. The resulting air bubbles block water transport by cavitation, therefore reducing water flow, rather than any benefits to the xylem.

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