"Single-celled Organisms" How cells constitute organisms PPT courseware 5

Description

"Single-celled Organisms" How cells constitute organisms PPT courseware 5

animal structure hierarchy

Cells—tissues—organs—systems—animal bodies

plant structure hierarchy

Cells - Tissues - Organs - Plants

learning target

1. Explain that single-cell organisms can complete life activities independently.

2. Give examples of the relationship between single-celled organisms and human life.

single cell organism

Organisms with only one cell in their body are called unicellular organisms. Unicellular organisms are composed of only a single cell, and all life activities are completed within a single cell.

Method steps

1. Take a drop of the culture medium from the surface of the Paramecium culture medium, place it on a glass slide, and observe the Paramecium with the naked eye.

2. Cover with a coverslip and observe the morphology and movement of the paramecium under a low-power microscope.

3. Add iodine solution to anesthetize the paramecium. Use a high-power microscope to observe the internal structure of the paramecium.

How to switch to high magnification lens?

Find an object (i.e. a paramecium) under low magnification and move it to the center of the field of view

Turn the converter and use the 40× objective lens

Turn the fine focus screw to adjust the object image to be clear

When excessive amounts of human domestic sewage and industrial wastewater are discharged into the seawater, resulting in excessive organic matter in the seawater, it will cause some single-celled animals (such as Naked Trichuris and Noctiluca) to multiply in large numbers. Because of their reddish body color, when they are densely packed together, they can discolor the seawater, called a red tide. According to research, this type of animal can produce a neurotoxin that can be stored in the body of crustaceans and is harmless to crustaceans. However, humans or other animals may be poisoned after eating crustaceans.

summary

Protozoa are the most primitive and lowest animals, and are the ancestors of the animal kingdom. Since the body is made up of one cell, it is also called a single-celled animal.

Paramecium lives in freshwater rich in organic matter and can be used to monitor water pollution.

If you were asked to find some single-celled organisms for experiments, what kind of environment would you go to collect them? What instrument would you use to test for the presence of single-celled organisms in the material you took? On what basis did you choose the instrument?

Classroom meets standards

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

The middle layer of culture medium A and any part of culture medium B

C The surface layer of the culture medium D The lower layer of the culture medium

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

Toward favorable stimuli and to avoid harmful stimuli

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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: 2024-09-09

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

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