What is the significance of leaf fall in the life of a leaf?

in the life of a leaf, leaf fall does not matter. it will simply fall and rot without the ability to photosynthesize, but in the meaning of a tree it is huge:
1. Toxins are eliminated along with fallen leaves
2. Foliage is thrown away so as not to break tree branches under the load of snow
3. Reduces transpiration of water and retains it at the root
4. When leaves rot under the crown of a tree, they constitute a natural fertilizer

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