What happens to the tension in the xylem when the stomata close and evaporation

Question

What happens to the tension in the xylem when the stomata close and evaporation stops? It continues to increase until the living cells of the leaf are fully hydrated. It goes to zero once evaporation ceases. It remains constant the moment the stomata close. It drops to a value closer to that of the water-filled pores in the soil. What happens to the tension in the xylem when the stomata close and evaporation stops? It continues to increase until the living cells of the leaf are fully hydrated. It goes to zero once evaporation ceases. It remains constant the moment the stomata close. It drops to a value closer to that of the water-filled pores in the soil.

Explanation / Answer

When the stromato close and evaporation stops, the tension in the xylem continues to increase until the living cells of the leaf are fully hydrated. This occurs according to the cohesion-tension theory of sap ascent.

This happens at night. Transpiration stops immediately when the stromata is closed. There is a cohesion of water molecules between each other and ahdhesion between the water molecules and the stem walls; water is held in the leaves ad stems when the stromata is closed and this increases the tension.

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