Questions about the types of plant tissues in junior high school organisms

What is written in our biology book is: protective tissue, vegetative tissue, transduction tissue, mechanical tissue, these four types, there is no meristem, and then ask, what is a meristem?

There are 4 types of plant tissues: meristems, protective tissues, vegetative tissues, and conductive tissues. This is from the junior high school biology book. There are also 4 types of animal tissues: epithelial tissue, muscle tissue, nervous tissue, and connective tissue.

I am a student this year, and both the teacher and the book say that there are five major tissues: protective tissue, mechanical tissue, nutritional tissue, grooming tissue, and distribution tissue.

1. In the root tip, the elongation zone and meristem are all below the root hair area, and the root hairs will not continue to move, which is indeed true. However, the elongation zone and meristem cells are constantly elongated, and the meristem cells continue to grow downward to form new meristem cells, and the original meristem cells continue to grow and elongate, becoming elongation cells, and the elongation cells will differentiate into different tissue cells (such as the transport tissue cells inside, and the epidermis is specialized into the cells of the root hair), that is, the mature zone. As a result, the cells in the lower elongation zone continue to differentiate into the mature zone cells with root hairs, which allow them to absorb water deeper into the zone.

2. a screen. Because the catheter transports water and inorganic salts, the color should be similar to that of an aqueous solution. The organic matter in the sieve tube dissolves in water and takes on the state of emulsion.

3、a。Large trees are predominantly xylem.

Meristem, which can be divided into other tissues, is distributed in the meristem of shoots and roots.

Protective tissues, which play a role in protecting internal weak tissues, are mainly distributed in plant epidermis, root crown, etc.

Conductive tissues, which play the role of transporting substances, are mainly ducts in roots and stems.

Vegetative tissues refer to various nutrients in the plant body, such as mesophyll, etc.

Dermal tissue system, vascular tissue system, and basic tissue system.

The dermal tissue system includes the epidermis and peridermis. The epidermis covers the surface of the plant body and is the protective layer of the plant body. The pericarp is the secondary protective layer of the plant and is the protective tissue that replaces the epidermis.

The vascular tissue system consists of two types of conductive tissues, namely the phloem, which transports organic nutrients, and the xylem, which transports water and minerals.

The basic tissue system is located between the epidermal tissue system and the vascular tissue system. The main basic tissues include a wide variety of parenchyma, thickiwall, and thick-angled tissues.

Plant tissues are generally divided into six categories: meristems, basic tissues, protective tissues, secretory tissues, mechanical tissues and conductive tissues, and the latter five categories are derived from meristems, so they are also collectively referred to as mature tissues or permanent tissues.

1. Meristem It is characterized by small cells, tight arrangement, no intercellular space, thin cell wall, large nucleus, concentrated cytoplasm, and no obvious vacuole fluid.

Meristems can be divided into primary meristems, primary meristems, and secondary meristems according to their different functions and functions.

2. Basic Tissue The basic organization occupies a large position in the plant body, is distributed in many parts of the plant body, and is the basis for the composition of the plant body. It is composed of parenchyma cells that mainly play the role of metabolic activity and nutrition, so it is also called parenchyma. It is characterized by a thin cell wall, and the characteristics of the cell are spherical, cylindrical, polyhedron, etc., and there are often gaps between cells.

3. Protecting the organization.

According to its differences, it can be divided into primary protective tissue - epidermal tissue and secondary protective tissue - periderm.

a) Epidermal tissue is distributed on the surface of young roots, stems, leaves, flowers, fruits and seeds. It usually consists of a layer of flattened rectangles, polygons, or wavy irregularities, chimeric to each other, closely arranged, and intercellular-free living cells.

A copy of the organic matter stored in the plant.

The tissues are mainly vegetative tissues, which are characterized by large cells, thin cell walls, large vacuoles, loose arrangement, and rich storage of nutrients.

Vegetative tissue, also known as parenchyma and basic tissue, is one of the main tissues of plants, and it is also the most basic tissue that constitutes the plant body. The roots, stems, leaves, flowers, fruits, and seeds of plants contain a large amount of nutrient tissue.

The cell wall of the vegetative tissue is thin and the vacuole is large, which has the function of storing nutrients for the cell to use. Vegetative tissues containing chloroplasts also carry out photosynthesis.

Vegetative tissue, which has a thin cell wall and large vacuoles, has the function of storing nutrients, and the vegetative tissue containing chloroplasts can also carry out photosynthesis.

These things are often distributed in various plants, for example, conductive tissues are widely distributed in ferns, gymnosperms, and angiosperms. The same is true for meristems. This is also relatively easy to understand, like the four major tissues in an animal:

Epithelial tissue, connective tissue, muscle tissue, nervous tissue, equally widely distributed in various animal bodies.

Except for algae and bryophytes, which do not contain conductive tissues, other plants: ferns and seed plants contain conductive tissues; I think what you're asking is: What organs are the four tissues of plants distributed in?

Meristems are found in the shoots, root tips and cambium of the stems of plants. Protective tissues are distributed on the upper and lower epidermis of the leaves, as well as on the surfaces of various organs; Others, such as conductive tissues and vegetative tissues, are distributed in the six organs of roots, stems, leaves, flowers, fruits, and seeds.

The transport tissues of plants are absent in ferns and seed plants, and in lower mosses and algae.