why do leaves or fruit fall on the ground after breaking form the tree?
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Detachment can occur when layers of parenchyma cells secrete cell wall enzymes to self-digest the middle lamella, which holds the cell walls together at the abscission zone. This causes the cells of the abscission zone to break apart and the leaf or other plant part to fall off.
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During that process, the trees lose a lot of water – so much water that when winter arrives, the trees are no longer able to get enough water to replace it. And so now we know. Leaves fall—or are pushed—off trees so that the tree can survive the winter and grow new leaves in the spring.
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