"Cells produce new cells through division" How cells constitute organisms PPT courseware 4

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"Cells produce new cells through division" How cells constitute organisms PPT courseware 4

1. Cell growth

Cell growth: The cells that make up an organism must constantly absorb nutrients from the surrounding environment and convert them into their own substances, and the size will change from small to large.

Reason: As the cell volume gradually increases, the ratio of its surface area to volume will become smaller, which affects the cell's absorption of nutrients and cannot meet the needs of growth.

2. Cell division

How do cells divide?

What is cell division?

Cell division is the division of one cell into two cells.

3. The difference between cell growth and cell division

independent learning one

1. Plant cell division process

Steps of cell division:

1. First, the nucleus is divided into two

2. Finally, the cytoplasm is divided into two

3. Finally, a new cell membrane is formed, and plant cells also form a new cell wall.

Independent learning 2

Task one:

1. What are chromosomes?

2. What do chromosomes consist of?

3. What is the relationship between cells, nuclei, chromosomes and DNA?

4. What are the changes in chromosome shape and number during cell division?

(Read the last two paragraphs on P57 of the textbook)

Task 2: Complete 3 of knowledge point 2 of P43 of "Centennial Academy"

Chromosomes: Those substances in cells that are stained darkly by basic dyes.

Composition: It is composed of two substances, ________ and ______

Changes in chromosome number, shape and number:

When a cell divides, the chromosomes are replicated. During the cell division process, the chromosomes are divided into two complete copies and enter two new cells respectively.

Thought 5

The morphology and number of chromosomes in new cells and original cells _________.

What's the point?

Enables genetic material to be passed accurately from one generation to the next.

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"Cells produce new cells through division" How cells constitute organisms PPT courseware 6:

"Cells produce new cells through division" How cells constitute living organisms PPT courseware 6 Review the past and learn the new 1. Inorganic substances and organic substances in cells 2. Cell membranes control the entry and exit of substances 3. Chloroplasts (the place of photosynthesis), the energy converters in cells Light energy change..

"Cells produce new cells through division" How cells constitute organisms PPT courseware 5:

"Cells produce new cells through division" How cells constitute organisms PPT courseware 5 1. Teaching objectives 1. Describe the basic process of cell division. 2. Say that the number of cells in an organism increases through cell division. 3. Name the roles of chromosomes before cell division..

"Cells produce new cells through division" How cells constitute organisms PPT courseware 3:

"Cells Produce New Cells Through Division" How Cells Constitute Organisms PPT Courseware 3 Section 1 Cells Produce New Cells Through Division Why can't cells grow indefinitely? Cell growth requires the cell surface to absorb nutrients from the outside world. The larger the surface area, the more nutrients it absorbs...

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Update Time: 2024-10-22

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

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