"Single-celled Organisms" How cells constitute organisms PPT courseware 6

Description

"Single-celled Organisms" How cells constitute organisms PPT courseware 6

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.

Common types of single-celled organisms

Most single-celled organisms live in water or moist environments, and some are parasitic on other organisms.

Method steps

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

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

If the paramecium moves too fast and it is difficult to observe, you can first put a few strands of cotton fibers on the droplets of culture solution on the slide, and then cover it with a coverslip.

The relationship between single-celled organisms and humans

harmful side

Plasmodium and dysentery-like amoeba threaten human health

Massive proliferation of brown algae and red algae in seawater causes red tides

summary

Protozoa are the most primitive and lowest animals and 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 ( )

Any part of the middle layer of culture medium A and 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

2. Paramecium lives in ( )

A In sea water B In human body C In soil D Pond or ditch

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

yeast

Yeast is a single-celled fungus

Paramecium

Paramecia are single-celled animals that live in water rich in organic matter.

Chlamydomonas

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

Eyeworm

Euglena are single-celled animals with a large number of oval chloroplasts in the cytoplasm. There is an eye point at the base of the flagellum, and there is a swollen part close to the eye point that can sense light. Euglena are phototaxis during movement.

amoeba

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.

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Update Time: 2024-07-04

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

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