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Nature & Animals

Which effect reduces water transport when a vascular plant's xylem air bubble reaches a pit membrane?

A)Cavitation spreads in adjacent vessels
B)Sugar loading in phloem increases
C)Root pressure immediately rises sharply
D)Stomata instantaneously close completely

💡 Explanation

Cavitation spreads due to air seeding through the thin pit membrane where the mechanism is loss of cohesion-tension. This allows air to enter neighboring xylem vessels because the differential pressure forces air across, therefore, embolism increases, rather than being localized.

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