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

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

Review microscope construction and use

Slices made from thin slices taken from an organism

Smear made of liquid biological material that has been smeared

Mounted films are made from small amounts of material torn or picked from living organisms.

Very tiny organisms can be directly made into films

(1) Preparation of temporary mounting slices of onion epidermal cells

1. Wipe the slides and coverslips clean with clean gauze.

2. Place the slide on the test stand and use a dropper to drop a drop of water in the center of the slide.

Preparation and observation of temporary mounts of plant cells

Wipe → drip → tear → unfold → cover → dye → absorb

1 Wipe: Wipe slides and coverslips

2 drops: Use a dropper to place a drop of water in the center of the slide

3 Tear: Use tweezers to tear off a piece from the inner epidermal leaf of the onion scale.

4 Exhibition: Flatten and place in the center of the water droplet

5 Cover: Cover the cover slip and gradually lower it from the water droplet side to prevent bubbles from forming.

6 Staining: Put a drop of iodine solution on one side of the coverslip

7 Aspiration: Use absorbent paper to aspirate from the other side of the coverslip to allow the dye solution to infiltrate the specimen.

1. Find the difference game

1 Plant cells do not have cell walls.

Plant cells have cell walls

2 Cell membranes contain genetic material.

The cell nucleus contains genetic material

3 Juice can be obtained by squeezing the fruit, and the juice mainly comes from the nucleus.

Squeezing the fruit produces juice, which comes primarily from the vacuoles.

4 The glass slide made by tearing off the inner epidermis of onion scale leaves is called a smear.

A glass slide made by tearing off the inner epidermis of onion scale leaves is called a slide.

5. The cell structure that is not easy to see clearly under a light microscope is the nucleus.

The cell structure that is not easily visible under a light microscope is the cell membrane.

Consolidation exercises

1. In order to prevent or reduce the generation of bubbles in the temporary mounting slide, the coverslip should be ( )

A. Place the coverslip flat on the slide

B. Add a few drops of water beforehand

C. Let one side of the cover slip touch the water droplet on the slide, and press it hard

D. Let one side of the cover slip touch the water droplets on the slide and lay it flat gently.

2. In plant cells, the structure that supports and protects cells is ( )

A cell wall B cell membrane C cytoplasm D cell nucleus

3. Use a microscope to observe the epidermal cells of onion scales. They can be observed in the field of view ( )

A closely arranged and oval

B is tightly arranged and rectangular

C is loosely arranged and oval

D is arranged in a loose, rectangular shape

4. The structure of cells from outside to inside is ( )

A cell membrane, cell wall, nucleus, cytoplasm

B cell wall, cell membrane, cytoplasm, nucleus

C cell wall, cell membrane, nucleus, cytoplasm

D cell wall, nucleus, cell membrane, cytoplasm

5. When observing the temporary film installation, if you see a circle with a bright center and dark periphery in the field of vision, the circle may be ( )

A Dirt B Bubbles C Cells D Ink

2. Picture recognition questions

1. Name each structure in the picture.

1 cell wall 2 cell membrane 3 chloroplast

4 Nucleus 5 Vacuole 6 Cytoplasm

2. Structure ① It has a protective and _____ effect on cells. The structure containing cell fluid is _____; the structure containing genetic material is _____;.

Thought questions:

1. How to distinguish cells and bubbles in the microscope field of view?

Generally speaking, bubbles appear as images with darker, wider edges in the microscope field of view, and are round or oval in shape. There is often a blank inside. Press lightly with the tip of tweezers, and the bubbles will deform or move.

2. A stain appears in the microscope field of view. Is there any way you can tell whether the stain is on the objective or the eyepiece?

Move the slide while observing. If the dirt moves with it, the dirt is on the slide;

Move the eyepiece while observing. If the dirt moves with it, the dirt is on the eyepiece;

If you have tried all the above and the dirt does not rotate, then the dirt is on the objective lens.

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Update Time: 2024-07-30

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

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