Why is the trunk conical Detail 0 3

During a tour, I stumbled upon an interesting phenomenon, the shape of a tree trunk.

What about the benefits? In order to figure out these questions, I went deeper**.

With my mother's help, I looked up the information and learned that stems are supporting plants.

body, an important structure that transports water and nutrients, it is mainly composed of spinal canal bundles. Branches of the stem.

The holding effect is mainly carried out by the wood fibers of the xylem, although the stems of woody plants increase from year to year.

Coarse, but in a certain time frame, the number of wood fibers is certain. That is to say:

The cross-sectional area of the stem of the tree is of a certain size. And then we're going to look around the hypothetical trunk cross-section.

The shape grows different, but the cross-sectional area is constant, design experiments, and explore the trunk in a cone.

Causes and advantages of the state.

After experiments, we found that: (1) when the cross-sectional area and length are constant, the triangular prism.

The longitudinal support force of the shape is the largest, and the transverse support force is the smallest. The cylindrical object supports the force longitudinally.

It is not as good as a triangular prism object, but has the greatest lateral bearing force; (2) and other qualities of different shapes.

tree trunks, short cones withstand the most winds; (3) Wind is a natural phenomenon that affects.

The shape of the cross-sectional area of the tree and the height of the shape of the tree growth. Approximately cone-shaped tree.

The center of gravity of the stem is low, and the huge root system is connected to the earth, and the center is lowered and stable.

Larger; (4) The cross-section of the tree is round, which can reduce damage and have stronger machinery.

Strength, able to withstand the attack of the wind. At the same time, under the influence of the wind, the trunk bends everywhere.

The degree of curvature is similar, and the trunk is less susceptible to damage, regardless of which direction the wind comes from, and the amount of resistance experienced by the trunk is similar.

In the course of my observations, experiments and analyses, I gradually explained and revealed the trunk shape.

The cone-shaped mystery increases the knowledge, links the learned knowledge to the actual application, consolidates the learned knowledge, and improves the interest in learning, and also preliminarily learns the subject.

Learn observation and analysis methods.

Why is the trunk conical? Understanding the stems of plants has a role in supporting the plant body, transporting water and other nutrients. The stems of trees are mainly made up of vascular bundles.

Although the stems of woody plants will thicken year by year, the number of wood fibers of the stems is certain within a certain time range, that is, the cross-sectional area of the tree stems is certain. Around the trunk cross-sectional area is fixed, assuming that the cross-section of the trunk grows into different shapes, the experiment is designed to explore the reasons and advantages of the conical shape of the trunk. After experimentation, we found that:

1) When the cross-sectional area and length are constant, the longitudinal support force of the triangular prism object is the largest, and the transverse bearing force is the smallest; The longitudinal support force of cylindrical objects is not as good as that of triangular prism objects, but the transverse bearing force is the largest; (2) Trunks of different shapes of equal mass, with short cone-shaped trunks bearing the greatest wind force; (3) Wind is a natural phenomenon that affects the shape of the cross-section of trees and the height of tree growth. The trunk is almost conical, with a low center of gravity, and with a large root system connected to the earth, the center of gravity is lowered lower and the stability is greater; (4) The trunk has a circular cross-section, which can reduce damage, has stronger mechanical strength, and can withstand the attack of wind. At the same time, due to the influence of wind, the degree of bending of the trunk is similar, regardless of the direction from which the wind comes from, the resistance of the trunk is similar, and the trunk is not easily damaged.

The above experiments reflect the laws of nature and the enlightenment of nature: (1) a columnar object with a triangular cross-section has the largest longitudinal support force, and its form can be used in construction, such as angle steel; (2) The cross-section is a circular circular object, which has the greatest lateral bearing force, and similar forms of building materials can be seen everywhere, such as TV towers, telephone poles, etc.