"Single-celled Organisms" How cells constitute organisms PPT courseware 4

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"Single-celled Organisms" How cells constitute organisms PPT courseware 4

Talk about it

Please introduce to everyone the smallest creature you know.

We know that plants and animals are composed of many cells, so are all living things on the earth like this?

Let's get to know a living thing made of one cell.

Please indicate the cell structure of the following organisms

An experiment to observe Paramecium

1. Suck a drop of the culture medium from the surface of the Paramecium culture medium and observe it with the naked eye and a magnifying glass.

2. Make mounting films and observe the shape and movement of Paramecium. (To prevent the Paramecium from moving too fast, put a few strands of cotton fiber on the slide)

Why absorb culture fluid on the surface?

How do paramecia move?

The structure and function of paramecium

Movement: Cilia (rotating forward in water)

Respiration: surface membrane (inhale oxygen, emit carbon dioxide)

Digestion: oral groove (where food enters)

Food bubble (food is digested)

Anus (discharge food debris)

Excretion: Collection tube (collects excess water and waste in the body)

Stretch bubbles (remove excess water and waste from the body)

Reproduction: The cell nucleus (macronucleus, micronucleus) divides

The relationship between single-celled organisms and humans

Beneficial:

Single-celled organisms are food for fish

Paramecium can purify sewage

harm:

It parasitizes the human body and harms human health. Such as Plasmodium, Entamoeba dysenteriae

Cause red tide and harm fisheries

Multiple choice questions:

1. When observing Paramecium, the best part to suck the Paramecium from the Paramecium culture medium with a straw is ( )

A middle layer B any part C surface layer D lower layer

2. How does Paramecium move in water ( )

A uses the flagella to make spiral movements

B uses the cilia to make spiral movements

C uses the flagellum to move in a straight line

D uses the cilia to move in a straight line

3. The excess water and waste in the body of Paramecium are discharged through ( )

A anus B telescopic vacuole C oral groove D endopharynx

4. When observing Paramecium, you often put some cotton fibers for the purpose of ( )

A fixes the paramecium B makes the paramecium move slowly for easy observation

C Separate culture medium D Absorb culture medium

Observe the stress of Paramecium as shown in the figure. Drop four drops of liquid on the glass plate respectively. A is the Paramecium culture medium, B is water, C is vinegar-containing solution, and D is solution containing beef juice.

1. During the experiment, first connect A to BCD. In order to clearly see the transport direction of the Paramecium after the connection, how should it be circulated? Please use arrows.

2. After being connected, the direction of movement of the Paramecium is from [ ] to [ ].

3. The above experiments show that Paramecium can

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For more information about the PPT courseware "How Single-Celled Biological Cells Constitute Organisms", please click the "How Single-Celled Biological Cells Constitute Biological Organisms" ppt tag.

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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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