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Nature & Animals

When xylem sap encounters a midday atmospheric vapor pressure deficit, which consequence results?

A)Increased water potential in xylem
B)Enhanced cavitation risk in xylem conduits
C)Decreased transpiration stream tensile strength
D)Reduced solute concentration in stem xylem

💡 Explanation

Higher demands impose greater tension via the cohesion-tension mechanism within the xylem, because vapor pressure deficit significantly lowers water potential, therefore xylem conduits become more prone to air bubble formation (cavitation) in conditions requiring heightened water transportation, rather than reduced transport.

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