"Plant Cells" Cells are the basic units of life activities PPT courseware 3

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"Plant Cells" Cells are the basic units of life activities PPT courseware 3

Think about it, discuss it

After Mengmeng learned how to use a microscope, she wanted to see what real cells looked like. She placed a spinach leaf on the stage of the microscope and followed the instructions for using the microscope, but she could not see the spinach cells. Why didn't Mengmeng observe the cells? Can you help her solve this problem?

Slide specimen type

Slices made from thin slices cut from biological material

Smear made of liquid biological material that has been smeared

Mounted films are made from small amounts of biological material that are torn off or picked out

discuss

1. What structures do the epidermal cells in onion scale leaves have in common with the pulp cells on the surface of cucumber (or Vallisneria or Hydrilla leaf cells)?

Answer: The same structures mainly include: cell wall, cell membrane, cytoplasm, nucleus, chloroplasts (mitochondria are generally not visible), vacuoles, etc.

2. What is the purpose of using iodine solution to treat the epidermal cells in onion scale leaves?

Answer: The inner epidermal cells of onion scale leaves are almost colorless. Iodine solution is used to stain cell nuclei so that they can be observed.

3. When making temporary mounting slides, what impact will staining have on the cells? Under what circumstances should unstained temporary mounts be used?

Staining can make the structure of cells appear more clearly. However, it will have a great impact on the biological activity of living cells, and sometimes it is even fatal. Therefore, unstained temporary mounts should be used when observing living cells and their biological activities.

4. 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.

5. Juice can be obtained by squeezing fruits. Which part of the cell structure does this juice mainly come from?

Mainly from the cell fluid in the vacuole.

Standard training

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 coverslip 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. Nucleus

3. Use a microscope to observe the epidermal cells of onion scales and tomato pulp cells. In the field of view, the former ( )

A. Closely arranged, oval B. Closely arranged, rectangular

C. Loosely arranged, oval D. Loosely arranged, rectangular

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 a dark periphery in your field of vision, the circle may be ( )

A. Dirt B. Bubbles C. Cells D. Ink

8. Picture recognition questions:

(1) Name each structure in the picture.

(2) Structure ① has protective and ______ effects on cells. Structure ② In addition to its protective effect, it can also control material _______ cells.

(3) The structure containing cellular fluid is ______; the structure containing genetic material is ______; the structure directly related to photosynthesis is ________.

(4) The substance represented by ⑥ in the figure is fluid, and its flow can accelerate the ___________ of substances inside and outside the cell.

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Update Time: 2024-10-05

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

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