Symbiosis
Presentation
•
Biology
•
9th - 12th Grade
•
Medium
Standards-aligned
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17 Slides • 7 Questions
1
Symbiosis - Biotic relationships
Today's agenda:
Review:
Density Dependent (biotic) limiting factors
Learn: (symbiosis) Are bacteria bad?
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Multiple Select
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Multiple Select
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Apple (organism) + Decomposer (organism) = Decomposition (rotten waste)
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Types of decomposers
Mushrooms and molds - Fungi
Bacteria
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Poll
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Poll
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Gangrene
Doctors with dirty hands infected soliers with a bacteria called gangrene. It eats away at the body but can be stopped with antibiotics. During the American Civil War antibiotics weren't invented yet.
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Symbiosis
Sym - together
bio - life
sis - process of
Sym-bio-sis
Symbiosis is the process of organisms living together
Every organism has a role to play in the ecosystem
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Review: Ecosystem Organization
Least complex - Organism
Most complex - Biosphere
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Review: Food Webs
Show where organisms get energy in their ecosystem
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Multiple Choice
This an example of
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Humans and Bacteria
A Symbiotic Relationship
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When can bacteria be "good"?
As they breakdown organic material, we benefit
Food production
Soil production
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When can bacteria be "bad"?
As bacteria breakdown material, we are harmed by it
Infection
Poison or toxicity
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Multiple Select
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Mutualism - Benefit both organisms
Benefits Bacteria and benefits Humans
Help us digest our food
Make vitamins (vitamin K)
Ferment foods (mmmm cheese)
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Commensalism - Benefits one, doesn't hurt the other
benefits bacteria and doesn't harm or help Humans
Bacteria live on our skin and in our respiratory tract and our intestines
Our body gives these bacteria an environment they can thrive without causing us harm
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Parasitic - Hurts one, benefits the other
Benefits the bacteria, hurts humans
Cause Disease \ Illness in host
Overcome the hosts defenses
Grow at the expense of the host
Produce toxins (poison)
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Bacterial Infections
We are infected with a bacteria
The bacteria grow exponentially
A limiting factor is introduced (antibiotic, fever, immune system)
Growth is limited
Host starts to recover, "bad" bacteria dies (best outcome)
Host isn't able to overcome bacteria, host dies (worst outcome)
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Open Ended
Symbiosis - Biotic relationships
Today's agenda:
Review:
Density Dependent (biotic) limiting factors
Learn: (symbiosis) Are bacteria bad?
Show answer
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