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"The Role of Bacteria and Fungi in Nature" Bacteria and Fungi PPT Courseware 7
learning target
1. Be able to tell the role of bacteria and fungi in material circulation
2. Understand the impact of bacteria and fungi on animals, plants and humans
Which organisms are the decomposers of ecosystems? What important role do they play?
Bacteria and fungi.
Their role cannot be underestimated!
They can break down organic matter into inorganic matter for plants to absorb and use.
1. Participate in the material cycle as a decomposer
Discussion 1: Why does Bacillus subtilis cause pears and bananas to rot?
Bacillus subtilis uses fruits as a nutrient source and obtains substances and energy by decomposing organic matter in fruits, causing fruits to rot.
Discussion 2: The forests in the south have lush vegetation and drop a large number of leaves every year, but the accumulated leaf litter is thinner than in the north. Please analyze the reasons.
Discussion 3
Some bacteria and fungi are saprophytic and some are parasitic, but their common lifestyle is the same. Can you tell me what it is? Why?
They all use readily available organic matter to live, and their nutritional methods are all heterotrophic.
summary
1. Most bacteria and fungi are decomposers in ecosystems.
2. Bacteria and fungi as decomposers feed (through) saprophytic life.
3. Promote the carbon and oxygen cycle in the biosphere.
2. Bacteria and fungi cause diseases in animals, plants and humans
Pathogens in bacteria and fungi
Camp parasitic life
Absorb nutrients from living animals, plants and humans. Causes different diseases in animals, plants and people
1. Streptococcus
Causes people to suffer from:
tonsillitis,
scarlet fever,
Erysipelas and many other diseases.
2. Fungi cause disease in many plants
3. Symbiosis with animals and plants
1. What is symbiosis?
Some bacteria and fungi live together with animals or plants, relying on each other and benefiting each other. Once separated, neither can live independently. This phenomenon is called symbiosis.
2. Bacteria and fungi symbiosis with plants
Example 1: Lichen - formed from the symbiosis of fungi and algae. Algae photosynthesis provides organic matter to fungi, and fungi supply algae water and inorganic salts.
Example 2: Root nodules of leguminous plants (peanuts, soybeans). Rhizobium converts nitrogen in the air into nitrogen-containing substances that plants can absorb, and plants provide organic matter for the root nodules.
3. Symbiosis between bacteria and fungi and animals
Example 1: Certain bacteria live in the gastrointestinal tract of herbivorous animals
Example 2: Some bacteria live in the human body and become normal flora in the human body
There are also a large number of bacteria in the human body, which have certain benefits for human health.
skill training
discuss:
1. Except for the absence of bacteria, other conditions must be the same.
2. Keeping it moist is conducive to bacterial growth.
3. Option 3. Because there were four conditions the same, only the experimental group was inoculated with bacteria.
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"The Role of Bacteria and Fungi in Nature" Bacteria and Fungi PPT Courseware 6:
"The Role of Bacteria and Fungi in Nature" Bacteria and Fungi PPT Courseware 6 Review and Thoughts 1. The biggest difference between fungi and bacteria? Bacteria do not have a formed nucleus; fungi have a formed nucleus 2. What types of morphology can bacteria be divided into? ? Cocci, bacilli, spiral...
"The Role of Bacteria and Fungi in Nature" Bacteria and Fungi PPT Courseware 5:
"The Role of Bacteria and Fungi in Nature" Bacteria and Fungi PPT Courseware 5 Objectives of this lesson: 1. Tell the role of bacteria and fungi in material circulation. 2. List the effects of bacteria and fungi on animals, plants and humans. 3. Comprehensively and from multiple angles and levels..
"The Role of Bacteria and Fungi in Nature" Bacteria and Fungi PPT Courseware 4:
"The Role of Bacteria and Fungi in Nature" Bacteria and Fungi PPT Courseware 4 Teaching Objectives 1. Tell the role of bacteria and fungi in material circulation. 2. List the effects of bacteria and fungi on animals, plants and humans. 3. Comprehensively understand... from multiple angles and levels.