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Which part of the plants falls off in a particular season to reduce the loss of water?

Plant leaves are the primary site of transpiration, which is the process by which plants lose water vapor through their stomata. During the winter months, plants reduce their metabolic activity to conserve water and energy. In deciduous plants, the leaves fall off in autumn to reduce water loss and to prepare for the winter. This process is called abscission. 

Stem is the main supporting structure of the plant, root refers to the underground part of the plant that absorbs water and nutrients, and fruit refers to the reproductive structure of the plant.