No. While leaves (particularly the leaves of succulent plants) do contain large amounts of water, the purpose of leaves is not to store water. As leaves conduct photosynthesis, in fact, a good deal of water vapor exits the plant through an organ in the leaves called the stomates (greek for gate). The process by which the leaf metabolizes C02 and releases water vapor is called transpiration. Water enters through the roots of the plant and into the xylum, which replaces the water lost in transpiration. The reason that trees loose their leaves in the winter is because the lack of water in the soil coupled with leaf-transpiration would cause the plant to become dehydrated.
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