Plant

1. Tree

Trees is a form of plant life, a herbaceous plant taller than the 22:00 grows on land in general and needs to be varying amounts of water.
Trees are generally distinct from the rest of the plant roots and the existence of stem and branches, and as big as the relative size compared with other plants and Kalhachaih Altahalb.kma that the mismatch multiple sizes of trees large and small




Nutrition and digestion process [edit]
The rest of the trees and plants vital process called photosynthesis or (photosynthesis), necessary for the growth of trees and elements (and plants in general) is water, light, carbon dioxide and chloroplasts.
Transport process [edit]
Through the xylem water is transferred to the parts of the tree and (plants in general) to the top of any of the root to the leg to the paper that is, it goes in one direction, and there are three hypotheses proposed for the interpretation of the transfer of water and a height in the high-height trees and these hypotheses are:
1. capillary
2. root pressure
3. The forces of cohesion and adhesion
And purify the air and through the bark tissue is ready transfer of food products, which is a process of photosynthesis, we are ready to move the food down any of the paper to the leg to the root has been moving in all directions, depending on the circumstances
Breathing and gas exchange process [edit]
Some imagine that the trees take carbon dioxide and oxygen only put this belief is false, trees and (generally Alebattat) are taking the oxygen and carbon dioxide put up day and night and at the same time, the process of photosynthesis. As the photosynthesis process faster than breathing the net result for the mutual gases is carbon dioxide and expel oxygen taken
 :
And own compositions for the exchange of gases in the wild trees:
* Stomata: It is a slots up between the internal fabric of paper outside and center, surrounded by all the gaps Bouklitin Harsitan containing a green Alblastaidiat, operating Klitan Alharstan to organize open the mouth and close it, Fa filled Hatana Alkhaliat water to open the gap and if the water came out closed the gap
* Lentoids: They are no holes in the legs with a hard trees in the outer layer and the function of gas exchange.
* Roots: in the process of gas exchange, where the gas can it spread through the membranes moist root hairs.
O operation [edit]
Disposal of solid waste [edit]
The reason for the waste is metabolism, but because the trees rely on carbohydrates and not on protein and because the metabolism in the slower ones in the animal trees they do not cause damage to the trees cells so the waste can Taatba in the trees cells and then get rid of them once part of the life cycle experienced by the trees. Ka that Taatkhalsam trees of waste in several ways vary depending on the type of trees.
Get rid of the excess water [edit]

It is to get rid of excess water in two ways transpiration process and the process of Aladmaa.
Several trees play a front-line roles, both ecologically (environmental) or economic. As the world's tallest trees exist in proximity to the city of San Francisco, California.
Ecological role (environmental) [edit]
Trees contribute to the ecological balance.
Working on soil stabilization.
Absorb carbon dioxide from the air and put (O2) in the light of day.
Absorbs excess water on the surface of the earth to prevent eroded.
There are species of trees such as the elimination able to germs and viruses including produced from materials such as pine trees, poplar, willow and eucalyptus and oak, cypress, juniper and bananas
Economic role [edit]
The production of wood for industry.
Source of many medicines.
Fruit, gum, produces cork.
A source of grazing and firewood production.
The wood of the most important products of trees and shrubs forest was brought Aharajeon traditional management and exploitation of natural forests and artificial woodlots for timber production primarily because of the article of importance in people's lives has been used human wood of old in swidden In construction and in the furniture industry and in craft industries, as spread the use of wood in abundance in the last century in the paper industry and Alsllowes derivatives and wood peeling ......... etc. In addition to wood, the trees and shrubs a variety of non-wood forest products used in human food and animal feed and in a wide range of industries such as tanning and cork, soap and glue in the food and pharmaceutical industries and aromatic. This is what gives the forest for the trees with special economic importance as a source of raw materials that the human needs in his daily life and the diversity of industrial activities and the development of its economy. This is in addition to the significant role played by trees and ornamental shrubs in the forest and in city planning and planting public streets, roads and protect it from dust and noise. Natural forests are a source of inexhaustible ornamental woody species forms crown and its leaves and trunk, length and color flowers and types of resistance to wind, fire and air pollution and noise.
The diverse use you find trees and shrubs forest in the life of contemporary societies gives Dndrologia or (flag trees) is particularly important, making us develop our study of forest trees and shrubs with the aid of modern means in the ratings and in environmental studies.