"Use a microscope to observe the living world around you (3)" Tiny world PPT courseware 3

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"Use a microscope to observe the living world around you (3)" Tiny world PPT courseware 3

Review the past and learn the new

All living things are made up of ( ).

The shapes of biological cells are diverse. The cells of different organisms are ( ), and the cells of different organs of organisms are also ( ).

The cell is the most basic ( ) unit of biology and the most basic ( ) unit of biology.

【teaching objectives】

Scientific concepts:

Using a microscope, you can see tiny organisms that are invisible to the naked eye.

There are many microorganisms of various forms living in the water.

Microorganisms usually have special structures and functions to adapt to their surrounding environment.

Microorganisms have biological characteristics, such as: having certain needs for the environment, responding to external stimuli, and being able to reproduce, etc.

Observe microorganisms under a microscope

Place the film on the stage and align the center part to be observed with the center of the light hole

Adjust the height of the lens tube so that a clearer image of the object appears in the field of view

Move the mount and search for organisms on the mount

After finding the creature, continue to adjust the height of the lens to make the image of the creature under the lens clearer.

Preliminarily identify whether it is a living thing (animals can move, and living things generally have relatively regular and complete individuals)

Draw the observed microorganisms

Students work in groups of two and draw the microorganisms they observed in their science notebooks or on page 18.

Identify and understand microorganisms

Compare the information on pages 18 and 22-24 to identify what kind of creature you observed. If it does not match the biology provided in the information, please check the information outside class. Teachers can also observe the microorganisms in the culture solution before class, and search for relevant information and pictures in advance to provide students with reference.

observe

1. Drop a drop of culture medium containing Paramecium in the center of the slide, put a few cotton fibers on the drop, and then cover it with a cover slip to create a temporary mount. (Use a straw to suck from the surface of the Paramecia culture medium. Why?)

2. Observe the mounted film under a microscope, find a paramecium, and observe its shape and movement with a low-power microscope.

Think: What characteristics do you think all single-celled organisms have in common?

①Small body ②Simple structure

③The entire body is composed of one cell

④Generally lives in water

Did you know that paramecium can purify sewage?

A paramecium can form about 60 food bubbles per hour, and each food bubble contains about 30 bacteria. Therefore, a paramecium can swallow about 43,000 bacteria every day, which has a good effect on sewage purification.

summary

Using a microscope, you can see tiny organisms that are invisible to the naked eye.

There are many microorganisms of various forms living in the water.

Microorganisms usually have special structures and functions to adapt to their surrounding environment.

Microorganisms have biological characteristics, such as: having certain needs for the environment, responding to external stimuli, and being able to reproduce, etc.

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Update Time: 2024-07-26

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 2 industry PPT template

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