why do deciduous trees lose leaves? how do they survive them?
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The shedding of leaves helps trees conserve water and energy. As unfavorable weather approaches, hormones in the trees trigger the process of abscission, whereby the leaves are actively cut off the tree by specialized cells.
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During winter, there is not enough light or water for photosynthesis. The trees live off the food they had stored during the summer. ... The phenomenon wherein plants “decide” to lose their leaves by sensing the length of nights, is called photoperiodism (from the Greek words for a light/time system).
Most trees do 'slow down' during winter, and deciduous trees that lose their leaves shut down photosynthesis entirely. Trees with needles (evergreen trees) that are retained over winter can actually photosynthesize during the winter.
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