Trees are essential for the survival of all organisms. Trees are known as the alveoli of earth and Amazon
rainforest is considered as the lungs of the world. Last year, the forestfire which ignited at the amazon
forest in the Brazil has provoked every natural activicts of the world. Countries from all around the
world was concerned at this fire.If anything happens to the amazon rainforest range it would affect the
equilibrium of the whole world. That is why amazon is protected with so much concern. Trees are
classified into different types according to different criterias. These classifications include classification
as softwoods and hardwoods, shrubs and trees etc. A popular method of classifying trees is according to
some physiological criteria are Evergreen and Decidious. Now a question arises in every readers mind.
What Is Evergreen and What is decidious?
Some particular trees would retain its foliage (greenry) throughout the year without any concern of the
weather. These trees are known as evergreen trees.While some species which are in the region is of
varying climate would experience weathering and would shed the leaves once or twice a year inorder to
Cope with the temperature change. These trees are known as the decidious trees. Those trees which are
present on the regions with low temperature or snowfall have the shape of a cone. Trees in some part of
Russia is an example for this. These trees have the shape of a cone, this special shape is used to protect
the tree from snowfall and temperature drop. The shapes of such trees gives a thorny view to aircrafts
above them. These trees are altered into these forms for the purpose of survival. In Northern America
and regions near that, they use the term evergreen as a synonym for conifer.