"Single-celled Organisms" How cells constitute organisms PPT courseware 9

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"Single-celled Organisms" How cells constitute organisms PPT courseware 9

Organisms in the biosphere that are difficult to see with the naked eye and have only one cell in their body are called unicellular organisms. Most of them live in aquatic environments.

1. Common single-celled organisms

Escherichia coli is distributed in nature, and most of it is non-pathogenic. It mainly lives in the intestines of humans or animals and is a normal flora. A small number of Escherichia coli are toxic and can cause diseases, such as extraintestinal infections and acute diarrhea.

Yeast: Yeast is a single-celled fungus often used in brewing and making bread.

Paramecium: It has a certain purification effect on sewage.

Chlamydomonas is a single-cell algae that lives in freshwater. There are two flagella at the front end, which can swim freely in the water.

Amoeba are single-celled animals that live in clear water ponds or shallow water with slow flow and lots of algae. Any part of its body surface can form protrusions called pseudopods.

(1) Structure of Paramecium

(2) Life of Paramecium:

Discussion: How does Paramecium solve physiological functions such as movement, respiration, feeding, digestion, waste elimination, and inheritance?

(3) Stressiness of Paramecium

Paramecium can move toward favorable stimuli and avoid harmful stimuli (i.e., seek benefits and avoid harm), and can respond to external stimuli.

(4) Reproduction of Paramecium: fission reproduction

Plasmodium vivax: transmitted by Anopheles mosquitoes, parasitizes in the human blood, causing anemia, hepatosplenomegaly, and even damage to brain tissue, which is life-threatening.

Bellworms: They grow abundantly in the ponds of wastewater treatment plants and can prey on large amounts of free bacteria to clarify the water. Therefore, it is an indicator for testing water quality.

3. The relationship between single cells and humans:

1. Beneficial: fish bait, purifying sewage.

2. Harmful: Causes diseases (such as malaria parasites, Entamoeba dysenteriae, etc.) and forms algal blooms and red tides.

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Update Time: 2024-11-22

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

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