Which feedback response decreases transpiration rate when abscisic acid concentration elevates rapidly in xylem sap?

💡 Explanation

When abscisic acid (ABA) concentration increases, ABA induces signaling pathways causing reduced influx of ions into guard cells driving osmosis weakening turgor pressure around stomata, limiting transpiration. Decreasing guard cell turgor leads to stomatal closure, rather than increased expansion, conductivity, or absorption, which require hormonal signalling and pressure gradients.

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