The growth process of trees

The process of tree growth is like this:

1, a seed fell into the soil, and after a period of time, it began to germinate when the conditions were suitable (mostly in spring), and a seed grew radicle, embryo and hypocotyl. Then continue to develop, the embryo develops to the outside, the radicle develops to the underground, and the hypocotyl develops to the middle.

2. Then, the leaves of plants begin to carry out photosynthesis and start to synthesize sugar (glucose). Then, the sugar is converted into starch in the processing occasions of leaves, and further substances such as protein and fat are synthesized. Then it is transported to all parts of plants through sieve tubes for their growth and development, and the roots absorb water, minerals, N elements and trace elements from the soil. And then transported to various parts through conduits for synthesis.

3. Year after year, day after day. The cell cambium, which plays the most critical role, is the main place for mitotic cell division in plants. Through its division, more and more cells and plants become thicker and thicker. In addition, plants grow mainly by absorbing water from dividing cells, and then grow.

Extended data:

Trees are tall woody plants, represented by "branches", "stems" and "leaves", which can survive for decades.

Generally speaking, a Screaming Trees tree has an upright trunk, tall plants and high branches from the ground, which can form a crown. There are many kinds of trees, some of which are called "trees", such as pomegranate trees and tea trees.

Trees are the floorboard of woody plants, including trees, shrubs and woody vines. Trees are mainly seed plants. Among ferns, only tree fern is a tree. There are about 8,000 kinds of trees in China. Divided into banyan trees; Poplar; Willow; Cypress, etc.

The four main parts of a tree are roots, stems, branches and leaves. Roots are underground, and there are many roots at the bottom of a tree.

The trunk is divided into five layers.

The first layer is bark, which is the surface layer of the trunk, which can protect trees and prevent the invasion of diseases.

Below the bark is phloem, a layer of fibrous tissue that carries sugar from the leaves.

The third layer is the cambium, which is very thin and is the growth part of the trunk. All other cells come from this layer.

The fourth layer is sapwood, which transports water from the roots to all parts of the tree. This layer is usually lighter than heartwood.

The fifth layer is heartwood, and heartwood is old sapwood, which is called xylem. Most trunks are heartwood. When a tree grows up, its roots will firmly entangle the soil under its body to prevent soil erosion.

References:

Baidu encyclopedia-the growth of trees