"The Life of Cells" Cells are the basic units of life activities PPT courseware 2

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"The Life of Cells" Cells are the basic units of life activities PPT courseware 2

substances contained in cells

Scientific research shows that water, oxygen, glucose, sucrose and many other substances are composed of molecules (a basic particle that constitutes substances).

Both water and sucrose are made up of molecules

Matter is made up of molecules

The dissolution of sucrose in water means that the sucrose molecules spread out and squeeze into the water molecules

1. Substances in cells can be divided into two categories

Distinguish between organic and inorganic substances?

Burn peanut seeds. After the seeds are burned, the remaining ash is inorganic salts, and the burned material is organic matter.

The life of cells requires water and a variety of other nutrients. When these substances enter the cell, they must pass through the cell's boundary - the cell membrane. The cell membrane separates the inside of the cell from the external environment, giving the cell a relatively stable internal environment. Does the cell membrane seal the cell?

2. The cell membrane controls the entry and exit of substances into the cell

The cell membrane does not seal the cell;

The cell membrane controls the entry and exit of substances

Useful substances, please come in;

Other substances, blocking blocking;

Cellular waste, get out, get out.

3. Energy converters in cells

Energy needed by plants: mitochondria, chemical energy in organic matter, chloroplasts, light energy

Energy needed by animal bodies Mitochondria Chemical energy of organic species (from food)

Mitochondria and chloroplasts are energy converters in cells.

Consolidation exercises

1 The structure in the cell that controls the entry and exit of substances is ( )

A cell wall B cell membrane

C Cytoplasm D Nucleus

2. The energy converter in animal cells is ( )

A mitochondria B cell membrane

C chloroplast D cell nucleus

3. The energy converters in plant cells are _ and _ ( )

A cell wall and chloroplasts

B cell membrane and mitochondria

C Cytoplasm and chloroplasts

D Mitochondria and chloroplasts

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Update Time: 2024-09-06

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

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