In second grade, do you know which trees have what characteristics they have?

<> "I didn't take a second-year biology course, but I can tell you some representative characteristics of trees:1Cypress:

The important feature is that the branches and leaves are side by side, forming a fan-shaped branch morphology. Some of the small branches are bent to one side and are in a curved state. 2.

Pine: has coniferous leaves, the leaves are long, thin, and resemble needles. 3.

Osmanthus tree: the crown is large and round, the branches are extended, the shape of the leaves is obovate, and the fragrance of flowers strikes. 4.

Cherry Blossom Trees: There are many varieties of trees with different heights and flower colors such as red, white, and pink. The flowering period is very short, and the flowers are like clouds, and they are very beautiful.

5.Maple tree: The plant has an elegant appearance, with lush branches and broad leaves, and a canopy like a pavilion or umbrella.

These trees all have different morphologies, leaves, flower colors, aromas, and other characteristics.

Large trees lined up neatly on both sides of the road, like two columns of mighty guards.

The big tree stood straight on the side of the road, like two mighty soldiers.

It reads as follows:Cypress: The trunk grows straight and tall, the leaves are small, scaly, and evergreen all year round.

Pine: The trunk is straight, the leaves are pointed, like a needle, and they are evergreen in all seasons.

Birch; The trunk is straight, the bark is white, and the leaves are ovate.

Maple: The trunk is not high, the red leaves are usually three-lobed, and the edges of the leaves are toothed.

Banyan tree: The trunk is branched, the crown is large, and the leaves are evergreen.

According to the type of tree growth, it is divided into:

1. Arbors are tall (usually 6 meters to tens of meters) and have obvious tall trunks.

2. Shrubs The body of the tree is short (usually less than 6 meters), and the bottom of the trunk is short.

3. Vine woody plants that can grow upward by winding or clinging to other objects (such as creepers).

4. Creeping trunks, branches, etc. grow creeping (such as paving cypress).

Characteristics of the tree:

1. Evergreen large tree with a straight trunk and a height of 30 to 36 meters.

2. The bark is gray-brown, and the longitudinal cracks are scaly and peeling off.

3. Winter buds are cylindrical, reddish-brown, stout, and resinless.

4. Two or three needles and a bundle of needles, 18 30 cm long, dark green, with stomatal lines on both sides of the ventral dorsal, and fine serrations on the edges.

Blooms in April. The fruit ripens in October and November of the following year, and the cones are long and conical, with 2 3 clusters.

6. The seeds are oval and triangular.

Composition of the tree: The four main parts of the tree are the roots, trunk, branches, and leaves. The roots of the tree are underground and there are many roots at the base of a tree.

In the part of the trunk is divided into five layers.

The first layer is the bark, which is the top layer of the trunk that protects the tree and prevents the invasion of diseases, underneath the bark is the phloem, which transports the sugars from the leaves, and the third layer is the cambium layer, which is very thin and is the growing part of the trunk, from which all other cells come from.

The fourth layer is the sapwood, which transports water from the roots to the rest of the tree, and is usually lighter than the heartwood. The fifth layer is the heartwood, which is the old sapwood, and the two are collectively called xylem. The trunk is mostly heartwood.

When the tree grows, its roots entangle the soil beneath its body, preventing soil erosion.

The role of trees: 1. Trees can maintain ecological balance.

Because trees can inhale carbon dioxide and exhale oxygen through photosynthesis, they can make the air fresher and cleaner. According to the survey, one acre of forest releases enough oxygen for sixty-five people to breathe. Trees and our human survival are closely related and inseparable.

2. Trees can prevent wind and fix sand.

Because the roots of the tree need to be strengthened, it can absorb a lot of dust and also conserve water and soil. An acre of forest can inhale 20-60 tons of dust every year, and in our daily life, the phenomenon of people cutting down the valve is very common, so there are some places that have also caused floods, the main reason is the loss of tree protection.

3. Other functions.

Needless to say, trees can also reduce noise pollution, with a 40-metre-wide forest strip reducing noise by 10-15 decibels. The secretions of trees can also kill bacteria, and in general, the open space has in every square meter.

Thirty or forty thousand bacteria, and the forest only.

Three, four hundred. In addition, large trees can also reduce temperature and increase humidity.