the pollen and air from the oxygen at this time of year makes the leaves dry up. this makes the roots loose their "hold" of the leaves and the leaves fall
deciduos
Trees and shrubs that lose their leaves in the Autumn.
Deciduous trees lose their leaves in autumn and and winter, then regrow them in spring. Evergreen trees never lose their leaves.
Deciduous trees lose their leaves each year. This is in contrast to evergreens which keep their leaves all year long.
Formation of abscess layer at the base of petiole
You have it backwards. Deciduous trees are the ones that lose their leaves in the winter. They're the ones with the colorful leaves in Fall. Conifers are the ones that stay green all year long. They can do that because they have thin needles instead of leaves, and needles don't freeze as easily as leaves do.
Coniferous trees only shed oldest leaves and keep the rest whereas deciduous trees shed leaves seasonally
Deciduous trees lose all their leaves in the Autumn.
Those are called artificial trees. Evergreen trees do not lose all their leaves at the same time, but DO lose leaves (needles).
Deciduous trees, such as oaks or aspens, lose their leaves in the autumn.
Deciduous trees.
Trees lose their leaves all the time, but rainforests do not shed their leaves all at once.