"Structural Hierarchy of Plants" How cells constitute organisms PPT courseware 2

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"Structural Hierarchy of Plants" How cells constitute organisms PPT courseware 2

Think about it and discuss it

Tomato epidermal cells are tightly arranged and have thick cell walls, which mainly play a protective role. Tomato pulp cells are loosely arranged, with thin cell walls and large vacuoles, which store nutrients. There are some tendons in the tomato pulp, and there are many tubular cells inside, which have the function of transporting water, inorganic salts and organic matter. When you eat tomatoes, the sweet and sour juice comes from the pulp cells, because the vacuoles of the pulp cells are large, and sugars, proteins and other substances are dissolved in the cell fluid.

By studying this section, you will know:

1. What are the tissues that make up the plant body?

2. What are the structural levels of plants?

1. Green flowering plants have six major organs

group discussion:

What organs does a green flowering plant consist of? What is the main function of each organ?

Roots transport water, inorganic salts and other substances

Stem performs photosynthesis to produce organic matter

leaf

flower reproduction

fruit

Seeds absorb water and inorganic salts

2. Several main tissues of plants

Tissue: A group of cells formed by many cells with similar shapes, identical structures and functions, united together

Tissue formation: tissue formation as a result of cell differentiation

1. Meristem

(1) Concept: In mature plants, there are always some undifferentiated cells that maintain the ability to divide throughout their lives. The tissue composed of such a group of cells is called a meristem.

(2) Characteristics: The cells of meristematic tissue are small, with thin cell walls, large nuclei, and dense cytoplasm. They have a strong ability to divide and can continuously divide to produce new cells, which can then differentiate to form other tissues.

(3) Distribution: stem tip, stem root (tip of young root)

2. Protective organizations

(1) Distribution: epidermis on the surface of roots, stems, leaves, etc.

(2) Function: protection function

3. Conveying organization

(1) Distribution: vessels (water and inorganic salts), sieve tubes (organic matter) in roots, stems, leaves, flowers, fruits, etc.

(2) Function: transporting water, inorganic salts and organic matter

composition of plants

The basic unit of plant structure and function

A cell group formed by the association of many cells with similar shapes, structures, and functions.

Different organizations are united in a certain order to form a structure with certain functions.

The six major organs of roots, stems, leaves, flowers, fruits, and seeds constitute a complete plant body.

Classroom standards met:

1. The following is the structural level of the plant body. Please fill in the names of the tissues and organs.

2. It is a common phenomenon that the lotus root is broken and the silk is connected. What tissue of the plant body does the "silk" here come from ( )

A. Protective tissue B. Nutritional tissue C. Meristematic tissue D. Transmission tissue

3. In which parts of the plant body are protective tissues distributed? What tissues run through the roots, stems, leaves and other organs of plants? If you pinch off the top of a branch, will the branch continue to grow? Why?

Protective tissue is mainly distributed on the surface of various organs of the plant body. The conductive tissue runs through the roots, stems, leaves and other organs, transporting water and inorganic salts absorbed by the roots to various parts of the plant body. If you pinch off the top of a branch of a plant, the branch will not be able to continue to grow upward because there is meristematic tissue at the top of the branch.

4. Peel an orange and point out the different tissues and organs that make up the orange while peeling.

Oranges are the fruit of a plant with seeds inside. There is peel on the outside, including orange peel and orange segments, which contain protective tissue, nutritional tissue, and conductive tissue. In addition to protective tissue and vegetative tissue, seeds also have meristematic tissue.

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Update Time: 2024-11-09

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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