"Structural Hierarchy of Organisms" PPT

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"Structural Hierarchy of Organisms" PPT

Part One: Learning Objectives

1. Master the processes of cell division, growth and differentiation.

2. Understand the significance of cell division, growth and differentiation.

Structural hierarchy of living organisms PPT, part 2 content: knowledge list

1. Cell division: A process in which a ______ splits into ______ after a series of complex changes. When a cell divides, the most striking feature is that ______ (a substance that is easily stained darkly by basic dyes) appears in the nucleus of the mother cell, which will eventually ______ into the two daughter cells.

2. Cell growth: The newly divided daughter cells are generally only half the size of the parent cells. They can absorb nutrients, synthesize ____________, and continue to grow.

3. Cell differentiation: After cells divide into daughter cells, some daughter cells continue to divide when they grow up, and some daughter cells change to form cells with ________.

4. The human body, like many living things, comes from one cell - a fertilized egg.

The complex structure of the human body is the result of the fertilized egg's continuous _______, _______, and _______.

Structural hierarchy of living organisms PPT, part 3: try exercises

1. As shown in Figure ①→④, which physiological process of amoeba cells is mainly represented ( )

A. Growth B. Differentiation

C. Split D. Repair

2. The development of a rabbit's fertilized egg into a jumping rabbit is the result of cells ________, ________ and ________.

3. As shown in the figure, 1 in the figure is the ________ process of cells, and the result is that the number of cells is ________. 2 in the figure is the ________ process of cells, which results in the formation of a cell group with _______________.

Structural hierarchy of living organisms PPT, part 4: analysis of examples

[Example 1] The progeny cells maintain a high degree of continuity and stability with the parent cells in terms of genetic material composition. The fundamental reason is ( )

A. During cell division, the chromosomes are copied into two copies and distributed equally to the two daughter cells.

B. During the process of cell differentiation, cells undergo specific changes in morphology and perform different functions.

C. Chromosomes do not change during cell growth.

D. During the process of cell division, growth and differentiation, the chromosomes are copied and evenly distributed into the two daughter cells.

Analyze the genetic material in the cell mainly on the chromosomes in the nucleus. Through cell division, the chromosomes in the nucleus can be copied into two copies and distributed equally to the two daughter cells. This ensures that the genetic material composition of the daughter cells is the same as that of the parent. Cells maintain a high level of continuity and stability.

[Example 2] The figure shows the process in which a fertilized egg undergoes cell division to form many cells and cells with different shapes and functions appear. The process of cell differentiation is ( )

A. ① B. ② C. ③ D. ④

Analysis: The diagram in this question shows the process of cell division and differentiation. The process of dividing one cell into two cells is called cell division. In the figure, ①→③ divides one cell (fertilized egg) into two cells, and the two cells become four...it is just that the number of cells increases, but the morphological structure of the cells does not. Changes occur, so ①→③ in the figure represents cell division; ④ in the figure changes in shape and function during the growth process of cells, forming cell groups with different shapes and functions, so ④ represents cell differentiation.

Structural hierarchy of living organisms PPT, Part 5: Classroom exercises

A. Basic pass

1. Human body development starts from one cell, and this cell is ()

A. Germ cells B. Fertilized eggs

C. Egg D. Sperm

2. After a cell divides twice, the number of daughter cells formed is ()

A. 1 B. 2

C. 4 D. 8

3. The reason why living organisms can maintain strong vitality is because ()

A. Most cells continue to differentiate

B. Cell division continues to produce new cells

C. Aging and death of original cells

D. Cells can grow from small to large

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"Structural Hierarchy of Organisms" PPT courseware:

"Structural Hierarchy of Living Organisms" PPT courseware Part One: Test Points Focus Test Point 1 Structural Hierarchy of Animal Bodies 1. Cells differentiate to form different tissues (1) During the process of ontogeny, the offspring produced by one or a type of cell through division, in ________,...

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Update Time: 2024-11-08

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 1 industry PPT template

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