To cope with adverse conditions of water loss during scarcity of water.
Dormancy.
The evergreen tree will stray green year round, has pine cones, and the ability to look after itself. The Broad leaf tree will shed all the foliage during the summer and go into a torpor.
Deciduous trees shed their leaves in the fall.
Autumn or Fall as some countries call it. :)
the tree is referred to as a deciduous tree.
Some trees (Madrone, Eucalyptus) shed leaves as a response to hot weather (such as in August).
All deciduous trees shed annually, but some shed later in the year than others, such as the Blood-oak, which sheds it leaves in spring, instead of fall. Trees that do not shed their leaves annually are not deciduous.
All pine trees have flowers but they are insignificant.
Trees that shed their leaves are called deciduous trees.
I presume you mean leaves. All deciduous trees lose their leaves in winter.
conifers
it is clalla