"Cell" PPT courseware

Description

"Cell" PPT courseware

Part One: History of Cell Discovery:

1. Qin and Han Dynasties: "Erya" recorded more than 590 species of animals and plants and incorporated them into a certain classification system.

2. Before the 17th century: People tried to answer the composition of plants and animals, but were limited by observation tools.

3. 1590: A Dutchman (Janssen) built the first microscope using two lenses.

4. 1665: British scientist Robert Hooke discovered cells.

5. 1831: British scientist Brown discovered that plant cells have nuclei.

6. 1840s: German scientists Schleiden and Schwann proposed the "cell theory".

Cell PPT, part 2: content of cell theory

(1) All animals and plants are composed of cells;

(2) Cells are the structural and functional units of organisms;

(3) Cells are produced by cell division.

cell

1. Shape

There are many shapes such as round, cubic, cylindrical, rhombus, polygon and so on.

2. Size

Cells are generally very small, ranging from one to tens of microns.

Cell PPT, the third part: animal cell structure and function:

cell membrane

Role: Protect cells and control material exchange between cells and the outside world

cell nucleus

Function: Contains genetic material and plays a role in passing on the family line.

cytoplasm

Function: a place for many life activities

Cell PPT, Part 4 content: Structure of plant cells:

cell wall

protect, support

(composition of cellulose)

cell membrane

chloroplast

place of photosynthesis

(Contains chlorophyll)

cell nucleus

think

1. The reason why tall trees can "stand tall on the sky and the earth" is related to what structure in plant cells?

The cell wall protects and supports cells and gives plant cells a certain shape.

2. Why are plant leaves usually green?

Plant leaf cells contain chloroplasts, which contain chlorophyll.

Cell PPT, Part 5: Practice

1. The basic structure of a cell consists of three parts: _________, _________ and _________.

2. The control center of cell life activities is ( )

A． Cell membrane B. Cytoplasm C. Cell nucleus D. vacuole

3. What parts does an animal cell include from outside to inside ( )

A. Cell wall, cell membrane, cytoplasm, nucleus

B. Cell wall, cytoplasm, nucleus

C. Cell membrane, cytoplasm, nucleus

D. Cell membrane, cytoplasm, nucleus, vacuole

4. Plant cells usually have a certain shape and are not easily deformed, mainly because ( )

A. Protective effect of cell membrane

B. Protective effect of cell wall

C. Supporting role of cell membrane

D. The supporting role of the cell wall

Keywords: Zhejiang Education Edition seventh grade science PPT courseware free download, cell PPT download, .PPT format;

For more information about the "Cell" PPT courseware, please click on the Cell PPT tab.

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Update Time: 2024-11-22

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

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