About Tree

Tree is a perennial woody plant. The tree is grouped like this: a woody plant with a single main stem or trunk with a distinct apex protruding from the soil. According to some writers, the minimum height of a tree should be 3 meters to 6 meters when it is fully developed. Some writers have set a minimum diameter of 10 cm. Other woody trees that do not meet these conditions, such as branched main stems or small-sized trees are called shrubs. Compared to other plants, the tree is long-lived, some trees live for thousands of years and can grow up to 115 meters tall.

Trees are an important element of natural beauty because they prevent erosion and create a weather-protected ecosystem under their foliage. Trees also play an important role in generating oxygen and removing carbon dioxide from the air and controlling ground temperature. They are a component of landscaping and agriculture, due to their aesthetic appeal and variety of fruits. Wood from trees is used to make various structures including houses and as fuel wood. According to 2005 estimates, there were about 4 billion trees in the world, about 61 per person.

Trees belong to many classes and genera of plants. Trees display a variety of shapes, leaf shapes and sizes, bark characteristics, and reproductive organs.

The plant form of the plant has evolved in the process of adapting to the changing environment, which has made it a classic example of parallel evolution. There are about 100,000 species of trees in the world, which is 25% of the total plant species6] Most tree species grow in the tropics, most of which have not yet been observed by botanists, so we know very little about the species' characteristics and limitations.

The oldest trees include tree ferns, horsetail and lycophytes, which originated in the Carboniferous era; The tree fern still survives, but today's horsetail and lycophytes are no longer treesLater, the Confucian, Ginkgo, Sycamore, and other nudists appeared in the Triassic, and in the Cretaceous, flowering plants were born. Currently most tree species are flowering (angiosperms) and conifers.

The important parts of a tree are roots, stems, stalks, bark, flowers, fruits and leaves. The trunk is mainly composed of auxiliary and transport tissues xylem and phloem. Wood is made of xylem cells, bark is made of phloem and other extracellular vascular cambium tissues. Based on the process of increasing the diameter of the stem, the tree can be divided into two parts: exogenous and endogenous. Most trees (all conifers and almost all deciduous trees) are exogenous, growing by the formation of new wood on the outside of their stems. Endogenous trees (such as palm and dragon trees, etc.) grow due to the formation of new parts on the inside.

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