Oh, kasam, you just asked about the exact diagram I've been drawing on my wall with a marker! Auxin transport is this one-way traffic system in plants, with PIN proteins acting like little pumps in the cell membranes to shunt the auxin hormone to where it's needed. That concentration at the shoot tip is what causes apical dominance—it tells the side buds to stay sleeping so the main shoot gets all the growth. But from my life? I've been staring at my sad money plant on the shop counter, and no matter the textbook, its side branch is growing wilder than the main one, fighting for the little sun from my doorway. So much for the apical boss being in charge.
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