Because it is winter or the environmental conditions are inclement for the plant in some other way.
To escape from hostile weather conditions
cause it is
During photosynthesis, plants make oxygen and water. Water then moves out of tiny holes on the leaves and into the air. The water vapor rises up into the atmosphere, and as it cools it condenses.
No. Hemlocks(Tsuga) are evergreens,so they do not lose their foliage in winter.
Evergreens do not lose their leaves in the winter. Deciduous trees are the name given to those trees that lose their leaves in the winter. There is also a such thing as evergreen deciduous trees which have characteristics of evergreens besides the fact that they DO lose their leaves in the winter.
Transpiration which is an evaporative process
The leaves tilt upwards in some plants to get light from both the surfaces of leaves to maximize photosynthesis.
Blueberry plants are deciduous, so they do lose them.
These plants are called evergreen plants
deciduous
To save water they lose their leaves in order to keep the water in the tree through out the harsh weather.
Transpiration.
transpiration
Trees that lose their leaves once a year are called "deciduous." In cooler climates this is usually in Autumn. In some climates plants lose their leaves in the Dry season these are also called deciduous. Losing all the leaves is the important part. Trees that stay green all year round are called "evergreen"
The term is "Evergreen" and refers to plants that retain their leaves throughout the winter months - for examples conifers (Pine, spruce, cedar etc.).As opposed to deciduous plants that shed their leaves during autumn (fall) and winter - for example: Oak, Ash, Poplar, Maple
Plants lose most of their water by transpiration through the stomata of the leaves.
Deciduous trees lose their leaves as the temperature gets cooler.
transpiration
Plants need to lose leaves in the fall because the leaves are very dry. In the winter, plants already have all their leaves lost in the fall, but they can't grow back because it is too cold. In the spring, it gets warmer so leaves can grow back. In the summer, a few leaves die because they are too hot and too dry.