Well, for NEET, we learn that during drought, abscisic acid binds to PYR/PYL receptors, which then inhibit protein phosphatases, leading to stomatal closure to save water. That's the theory in my notes. But honestly, yaar, seeing our own apple trees wilt in a dry spell makes me think it's not such a perfect, instant system—it feels more like a desperate, last-ditch effort. The leaves still look so thirsty, even after all that internal signalling.
#exams#study
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