Podcast
Questions and Answers
Which of the following best describes a symbiotic relationship?
Which of the following best describes a symbiotic relationship?
- One organism benefits while the other is harmed.
- Both organisms benefit from the relationship. (correct)
- One organism benefits while the other is unaffected.
- Both organisms compete for the same resources.
What is the primary role of Rhizobium bacteria in their relationship with soybeans?
What is the primary role of Rhizobium bacteria in their relationship with soybeans?
- To produce sugars for the soybean plant.
- To extract water from the soybean roots.
- To fix nitrogen, making it available to the plant. (correct)
- To protect the soybean from other soil organisms.
In a parasitic relationship, what is the outcome for the host organism?
In a parasitic relationship, what is the outcome for the host organism?
- The host is harmed by the relationship. (correct)
- The host is neither harmed nor benefited.
- The host benefits from the relationship.
- The host may initially be harmed, but will benefit in the long run.
How does mistletoe obtain its necessary resources?
How does mistletoe obtain its necessary resources?
Which is a primary benefit provided by soil organisms to plants through symbiotic relationships?
Which is a primary benefit provided by soil organisms to plants through symbiotic relationships?
Flashcards
Symbiosis
Symbiosis
A close relationship between organisms of different species where at least one benefits.
Parasitism
Parasitism
An interaction where one organism benefits by harming another.
Plant Interactions
Plant Interactions
Plants forming close relationships with soil organisms like bacteria and fungi.
Nitrogen Fixation
Nitrogen Fixation
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Legumes and Nitrogen Fixation
Legumes and Nitrogen Fixation
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Study Notes
Symbiosis
- Symbiosis means "living together"
- A close relationship between organisms of different species
- One species benefits, while the other benefits or is unaffected.
Parasitism
- One organism (parasite) benefits at the expense of another (host).
- The parasite gains nutrients by living on or in the host.
- Examples include mistletoe (Viscum album)
Plant Symbiosis with Bacteria
- Some plants live in symbiosis with bacteria like Rhizobium
- Rhizobium bacteria in root nodules of plants
- They convert atmospheric nitrogen into usable form for the plant.
- The plant provides the bacteria with sugars.
Plant Nutrient Acquisition
- Plants need nutrients from the soil and air.
- Some plants get nutrients through close relationships with other organisms
- These relationships can be symbiotic or parasitic.
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