"Cell Division and Differentiation" PPT courseware

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"Cell Division and Differentiation" PPT courseware

Part One: Knowledge Review

1. The first person to discover cells was _______. What he discovered was a dead cell. In fact, the cell was just a _______ structure.

2. The basic structures of cells include _______, _______ and _______, and the unique structures of plants include _______, _______ and _______.

3. What are the basic units that make up the structure and function of living organisms?

Question: Human beings develop from fertilized eggs. How does it become a person?

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Preview the first paragraph and fill in the blanks below:

In the growth process of life, cells produce new cells through __________, and the new cells gradually change their _______,

_______and_______.

Cell division and differentiation are the basis of _______ of organisms, from _______ to _______, and from _______ to _______.

Cell division and differentiation PPT, Part 2: Cell division

Cell division causes the number of cells to _______. The volume of a newly divided cell is _______, and as the cell _______, its volume is _______. The number of cells_______, the volume_______, and the organism will continue to grow.

Schematic diagram of plant cell division process

The nucleus is first divided into two; then, the cytoplasm is divided into two parts, each containing a nucleus; finally, a new cell membrane is formed in the center of the original cell, and a new cell wall is formed.

Schematic diagram of animal cell division process

The first step in the basic process of cell division: the nucleus divides into two;

Step 2: Form a new cell membrane and cell wall in the center of the two nuclei (animals do not form cell walls), dividing the cytoplasm into two.

Cell division and differentiation PPT, part 3: practice

1. The last step of animal cell division is to form a new one in the center of the original cell ( )

A. Cell wall B. Cell membrane

C.Cell wall and cell membrane D.Nucleus

2. The correct sequence of plant cell division process is ( )

A, ① ② ③ B, ③ ② ① C, ① ③ ②

D. ③ ① ②

①. The cell nucleus is divided into two evenly

②. The cytoplasm is evenly divided into two parts, each part contains a nucleus.

③. Form new cell membrane and cell wall in the center of the cell

Cell division and differentiation PPT, part 4 content: reasons why organisms grow

1. Cell division increases the number of cells;

2. Cell growth. The size of newly divided cells is small. As the cells grow, their size gradually increases.

Summary: As the number of cells increases and the volume increases, the organism continues to grow from small to large.

Why cells cannot grow indefinitely

Because during the growth process of cells, the cell volume becomes larger and larger, and the ratio of the surface area to the volume of the cell membrane becomes smaller and smaller. The nutrients absorbed through the cell membrane are far from being able to meet the demand for nutrients as the cell volume increases. This causes As cells grow, they get less and less nutrients, so cell growth is not unlimited.

The result of cell differentiation

Cells differentiate to form different cell populations (tissues).

1. Cells divide, but their size does not necessarily increase. The cell size is very small just after division is completed.

2. Cell differentiation must be based on cell division.

That is, differentiation must be accompanied by division, but dividing cells do not necessarily differentiate.

3. During the process of cell division, growth, and differentiation, the genetic material does not change.

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware free download, cell division and differentiation PPT download, .PPT format;

For more information about the PPT courseware "Cells are the basic unit of life activities, cell division and differentiation", please click the cell is the basic unit of life activities ppt cell division and differentiation ppt tag.

"Cell Division and Differentiation" PPT download:

"Cell Division and Differentiation" PPT download Part One: Learning Objectives 1. Describe the basic process of cell division. 2. Overview Various tissues of organisms are formed by cell division and differentiation. 3. Identify several basic tissues of the human body and several main types of plants..

"Cell Division and Differentiation" PPT:

"Cell Division and Differentiation" PPT Part One Content: Teaching Objectives: Knowledge and Ability 1. Describe the basic process of cell division. 2. Overview Various tissues of organisms are formed by cell division and differentiation. 3. Identify several basic tissues and plants of animals..

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Update Time: 2024-07-29

This template belongs to biology courseware Jiangsu Education Edition Seventh Grade Biology Volume 1 industry PPT template

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