| Category | Format | Size |
|---|---|---|
| Zhejiang Education Edition Seventh Grade Science Volume 1 | pptx | 6 MB |
"Diversity of Species" PPT download
Description
"Diversity of Species" PPT download
Part I: Characteristics of single-celled organisms:
(1) Small individual;
(2) All life activities are completed within one cell;
(3) Generally live in water.
Look carefully: What are the similarities and differences between Chlamydomonas and plant cells?
What are the differences between Chlamydomonas and onion epidermal cells?
Similar points: they all have cytoplasm, cell wall, nucleus, and cell membrane.
Differences: Chlamydomonas has flagella, telescopic vesicles, eyespots, chloroplasts, etc. Onion epidermal cells do not, but they have vacuoles.
Diversity of species PPT, part 2 content: Thinking:
1. Are there chloroplasts in Paramecium?
No chloroplasts
2. When a paramecium moves, which end usually comes first?
The small end or rounded end is in front (with groove end)
3. Based on your understanding of animal feeding and digestion, imagine which structures of Paramecium may be involved in food feeding and digestion?
Oral groove - feeding; food bubble - digestion.
4. What is the function of the cell membrane of Paramecium? What is the function of the surface membrane?
Material exchange with the outside world. (for gas exchange)
5. In the experiment of observing Paramecium, which layer of the culture medium were the droplets used for observation taken from? Why?
Taken from the upper layer of culture medium. Because Paramecium needs oxygen, there is more oxygen in the upper layer.
6. When observing Paramecium with a microscope, some cotton silk is often put in the culture medium for temporary mounting of slides. What is the effect?
Limit paramecium movement
Diversity of species PPT, part 3 content: thinking and discussion:
Compare the characteristics of unicellular organisms and multicellular organisms and talk about their differences?
All life activities of single-celled organisms are completed within one cell. Multicellular organisms differentiate into different tissues, organs, and systems, which divide labor and cooperate with each other. Make living things show various life phenomena.
Organisms can respond to external stimuli to a certain extent. Although the structure of Paramecium is very simple, it can respond to favorable or harmful external stimuli. Analyze and answer the questions based on the text above and the picture below. (1) In Figure A, the moving direction of the paramecium is
In Figure B, the moving direction of the paramecium is __________.
(2) The reasons for the different phenomena are:
A: Salt is an unfavorable stimulus to Paramecium, so the Paramecium has to swim into the culture medium without salt.
B: The conclusion that can be drawn from this is:
Paramecium tends to favorable stimuli and avoids harmful stimuli
Keywords: Zhejiang Education Edition seventh grade science PPT courseware free download, species diversity PPT download, .PPT format;
For more information about the "Diversity of Species" PPT courseware, please click the "Diversity of Species" ppt tab.
"Diversity of Species" PPT courseware:
The first part of the "Diversity of Species" PPT courseware content: Protection of species diversity 1. The significance of the protection of biological species diversity: (the value of biological diversity) 1. Direct use value: medicinal value, industrial raw materials, scientific research value, Aesthetic value 2. Time...
"Diversity of Species" PPT:
"Diversity of Species" PPT A variety of creatures live in vastly different natural environments. At present, there are about 5 million species of living things on the earth, of which about 1.75 million have been recorded in literature. This shows that: biological species have the characteristics of diversity...
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Update Time: 2024-06-25
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